diff options
| -rw-r--r-- | sysdeps/x86_64/multiarch/stpncpy-evex.S | 5 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcat-evex.S | 291 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S | 110 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcpy-evex.S | 1282 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strncat-evex.S | 525 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strncpy-evex.S | 995 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strncpy-or-cat-overflow-def.h | 80 |
7 files changed, 2115 insertions, 1173 deletions
diff --git a/sysdeps/x86_64/multiarch/stpncpy-evex.S b/sysdeps/x86_64/multiarch/stpncpy-evex.S index 99ea76a..3693491 100644 --- a/sysdeps/x86_64/multiarch/stpncpy-evex.S +++ b/sysdeps/x86_64/multiarch/stpncpy-evex.S @@ -3,6 +3,5 @@ #endif #define USE_AS_STPCPY -#define USE_AS_STRNCPY -#define STRCPY STPNCPY -#include "strcpy-evex.S" +#define STRNCPY STPNCPY +#include "strncpy-evex.S" diff --git a/sysdeps/x86_64/multiarch/strcat-evex.S b/sysdeps/x86_64/multiarch/strcat-evex.S index 0e2df94..b4207b7 100644 --- a/sysdeps/x86_64/multiarch/strcat-evex.S +++ b/sysdeps/x86_64/multiarch/strcat-evex.S @@ -1,286 +1,7 @@ -/* strcat with 256-bit EVEX instructions. - Copyright (C) 2021-2022 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <https://www.gnu.org/licenses/>. */ - -#include <isa-level.h> - -#if ISA_SHOULD_BUILD (4) - - -# include <sysdep.h> - -# ifndef STRCAT -# define STRCAT __strcat_evex -# endif - -# define VMOVU vmovdqu64 -# define VMOVA vmovdqa64 - -/* zero register */ -# define XMMZERO xmm16 -# define YMMZERO ymm16 -# define YMM0 ymm17 -# define YMM1 ymm18 - -# define USE_AS_STRCAT - -/* Number of bytes in a vector register */ -# define VEC_SIZE 32 - - .section .text.evex,"ax",@progbits -ENTRY (STRCAT) - mov %rdi, %r9 -# ifdef USE_AS_STRNCAT - mov %rdx, %r8 -# endif - - xor %eax, %eax - mov %edi, %ecx - and $((VEC_SIZE * 4) - 1), %ecx - vpxorq %XMMZERO, %XMMZERO, %XMMZERO - cmp $(VEC_SIZE * 3), %ecx - ja L(fourth_vector_boundary) - vpcmpb $0, (%rdi), %YMMZERO, %k0 - kmovd %k0, %edx - test %edx, %edx - jnz L(exit_null_on_first_vector) - mov %rdi, %rax - and $-VEC_SIZE, %rax - jmp L(align_vec_size_start) -L(fourth_vector_boundary): - mov %rdi, %rax - and $-VEC_SIZE, %rax - vpcmpb $0, (%rax), %YMMZERO, %k0 - mov $-1, %r10d - sub %rax, %rcx - shl %cl, %r10d - kmovd %k0, %edx - and %r10d, %edx - jnz L(exit) - -L(align_vec_size_start): - vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0 - kmovd %k0, %edx - test %edx, %edx - jnz L(exit_null_on_second_vector) - - vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(exit_null_on_third_vector) - - vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2 - kmovd %k2, %edx - test %edx, %edx - jnz L(exit_null_on_fourth_vector) - - vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3 - kmovd %k3, %edx - test %edx, %edx - jnz L(exit_null_on_fifth_vector) - - vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4 - add $(VEC_SIZE * 4), %rax - kmovd %k4, %edx - test %edx, %edx - jnz L(exit_null_on_second_vector) - - vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(exit_null_on_third_vector) - - vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2 - kmovd %k2, %edx - test %edx, %edx - jnz L(exit_null_on_fourth_vector) - - vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3 - kmovd %k3, %edx - test %edx, %edx - jnz L(exit_null_on_fifth_vector) - - vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4 - kmovd %k4, %edx - add $(VEC_SIZE * 4), %rax - test %edx, %edx - jnz L(exit_null_on_second_vector) - - vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(exit_null_on_third_vector) - - vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2 - kmovd %k2, %edx - test %edx, %edx - jnz L(exit_null_on_fourth_vector) - - vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3 - kmovd %k3, %edx - test %edx, %edx - jnz L(exit_null_on_fifth_vector) - - vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4 - add $(VEC_SIZE * 4), %rax - kmovd %k4, %edx - test %edx, %edx - jnz L(exit_null_on_second_vector) - - vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(exit_null_on_third_vector) - - vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2 - kmovd %k2, %edx - test %edx, %edx - jnz L(exit_null_on_fourth_vector) - - vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3 - kmovd %k3, %edx - test %edx, %edx - jnz L(exit_null_on_fifth_vector) - - test $((VEC_SIZE * 4) - 1), %rax - jz L(align_four_vec_loop) - - vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4 - add $(VEC_SIZE * 5), %rax - kmovd %k4, %edx - test %edx, %edx - jnz L(exit) - - test $((VEC_SIZE * 4) - 1), %rax - jz L(align_four_vec_loop) - - vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0 - add $VEC_SIZE, %rax - kmovd %k0, %edx - test %edx, %edx - jnz L(exit) - - test $((VEC_SIZE * 4) - 1), %rax - jz L(align_four_vec_loop) - - vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0 - add $VEC_SIZE, %rax - kmovd %k0, %edx - test %edx, %edx - jnz L(exit) - - test $((VEC_SIZE * 4) - 1), %rax - jz L(align_four_vec_loop) - - vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k1 - add $VEC_SIZE, %rax - kmovd %k1, %edx - test %edx, %edx - jnz L(exit) - - add $VEC_SIZE, %rax - - .p2align 4 -L(align_four_vec_loop): - VMOVA (%rax), %YMM0 - VMOVA (VEC_SIZE * 2)(%rax), %YMM1 - vpminub VEC_SIZE(%rax), %YMM0, %YMM0 - vpminub (VEC_SIZE * 3)(%rax), %YMM1, %YMM1 - vpminub %YMM0, %YMM1, %YMM0 - /* If K0 != 0, there is a null byte. */ - vpcmpb $0, %YMM0, %YMMZERO, %k0 - add $(VEC_SIZE * 4), %rax - ktestd %k0, %k0 - jz L(align_four_vec_loop) - - vpcmpb $0, -(VEC_SIZE * 4)(%rax), %YMMZERO, %k0 - sub $(VEC_SIZE * 5), %rax - kmovd %k0, %edx - test %edx, %edx - jnz L(exit_null_on_second_vector) - - vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(exit_null_on_third_vector) - - vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2 - kmovd %k2, %edx - test %edx, %edx - jnz L(exit_null_on_fourth_vector) - - vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3 - kmovd %k3, %edx - sub %rdi, %rax - bsf %rdx, %rdx - add %rdx, %rax - add $(VEC_SIZE * 4), %rax - jmp L(StartStrcpyPart) - - .p2align 4 -L(exit): - sub %rdi, %rax -L(exit_null_on_first_vector): - bsf %rdx, %rdx - add %rdx, %rax - jmp L(StartStrcpyPart) - - .p2align 4 -L(exit_null_on_second_vector): - sub %rdi, %rax - bsf %rdx, %rdx - add %rdx, %rax - add $VEC_SIZE, %rax - jmp L(StartStrcpyPart) - - .p2align 4 -L(exit_null_on_third_vector): - sub %rdi, %rax - bsf %rdx, %rdx - add %rdx, %rax - add $(VEC_SIZE * 2), %rax - jmp L(StartStrcpyPart) - - .p2align 4 -L(exit_null_on_fourth_vector): - sub %rdi, %rax - bsf %rdx, %rdx - add %rdx, %rax - add $(VEC_SIZE * 3), %rax - jmp L(StartStrcpyPart) - - .p2align 4 -L(exit_null_on_fifth_vector): - sub %rdi, %rax - bsf %rdx, %rdx - add %rdx, %rax - add $(VEC_SIZE * 4), %rax - - .p2align 4 -L(StartStrcpyPart): - lea (%r9, %rax), %rdi - mov %rsi, %rcx - mov %r9, %rax /* save result */ - -# ifdef USE_AS_STRNCAT - test %r8, %r8 - jz L(ExitZero) -# define USE_AS_STRNCPY -# endif - -# include "strcpy-evex.S" +#ifndef STRCAT +# define STRCAT __strcat_evex #endif + +#define USE_AS_STRCAT +#define STRCPY STRCAT +#include "strcpy-evex.S" diff --git a/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S b/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S new file mode 100644 index 0000000..9530d7b --- /dev/null +++ b/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S @@ -0,0 +1,110 @@ +/* strlen used for begining of str{n}cat using EVEX 256/512. + Copyright (C) 2011-2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + + +/* NOTE: This file is meant to be included by strcat-evex or + strncat-evex and does not standalone. Before including %rdi + must be saved in %rax. */ + + +/* Simple strlen implementation that ends at + L(strcat_strlen_done). */ + vpxorq %VZERO_128, %VZERO_128, %VZERO_128 + movq %rdi, %r8 + andq $(VEC_SIZE * -1), %r8 + VPCMPEQ (%r8), %VZERO, %k0 + KMOV %k0, %VRCX +#ifdef USE_AS_WCSCPY + subl %r8d, %edi + shrl $2, %edi +#endif + shrx %VRDI, %VRCX, %VRCX +#ifdef USE_AS_WCSCPY + movq %rax, %rdi +#endif + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + + VPCMPEQ VEC_SIZE(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + leaq (VEC_SIZE)(%r8), %rdi + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + VPCMPEQ (VEC_SIZE * 2)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v1) + + VPCMPEQ (VEC_SIZE * 3)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v2) + + VPCMPEQ (VEC_SIZE * 4)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v3) + + andq $-(VEC_SIZE * 4), %rdi + .p2align 4,, 8 +L(loop_2x_vec): + VMOVA (VEC_SIZE * 4)(%rdi), %VMM(0) + VPMIN (VEC_SIZE * 5)(%rdi), %VMM(0), %VMM(1) + VMOVA (VEC_SIZE * 6)(%rdi), %VMM(2) + VPMIN (VEC_SIZE * 7)(%rdi), %VMM(2), %VMM(3) + VPTESTN %VMM(1), %VMM(1), %k1 + VPTESTN %VMM(3), %VMM(3), %k3 + subq $(VEC_SIZE * -4), %rdi + KORTEST %k1, %k3 + jz L(loop_2x_vec) + + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + KMOV %k1, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v1) + + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v2) + + KMOV %k3, %VRCX +L(bsf_and_done_v3): + addq $VEC_SIZE, %rdi +L(bsf_and_done_v2): + bsf %VRCX, %VRCX + leaq (VEC_SIZE * 2)(%rdi, %rcx, CHAR_SIZE), %rdi + jmp L(strcat_strlen_done) + + .p2align 4,, 4 +L(bsf_and_done_v1): + addq $VEC_SIZE, %rdi +L(bsf_and_done_v0): + bsf %VRCX, %VRCX +#ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +#else + addq %rcx, %rdi +#endif +L(strcat_strlen_done): diff --git a/sysdeps/x86_64/multiarch/strcpy-evex.S b/sysdeps/x86_64/multiarch/strcpy-evex.S index 82e45ac..932129a 100644 --- a/sysdeps/x86_64/multiarch/strcpy-evex.S +++ b/sysdeps/x86_64/multiarch/strcpy-evex.S @@ -1,4 +1,4 @@ -/* strcpy with 256-bit EVEX instructions. +/* {wcs|wcp|str|stp}cpy with 256/512-bit EVEX instructions. Copyright (C) 2021-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -17,990 +17,526 @@ <https://www.gnu.org/licenses/>. */ #include <isa-level.h> - #if ISA_SHOULD_BUILD (4) -# ifndef USE_AS_STRCAT -# include <sysdep.h> + /* Use evex-masked stores for small sizes. Turned off at the + moment. */ +# define USE_EVEX_MASKED_STORE 0 + /* Use movsb in page cross case to save code size. */ +# define USE_MOVSB_IN_PAGE_CROSS 1 -# ifndef STRCPY -# define STRCPY __strcpy_evex -# endif +# include <sysdep.h> +# ifndef VEC_SIZE +# include "x86-evex256-vecs.h" # endif -# define VMOVU vmovdqu64 -# define VMOVA vmovdqa64 - -/* Number of bytes in a vector register */ -# ifndef VEC_SIZE -# define VEC_SIZE 32 +# ifndef STRCPY +# define STRCPY __strcpy_evex # endif -# define XMM2 xmm18 -# define XMM3 xmm19 -# define YMM2 ymm18 -# define YMM3 ymm19 -# define YMM4 ymm20 -# define YMM5 ymm21 -# define YMM6 ymm22 -# define YMM7 ymm23 +# ifdef USE_AS_WCSCPY +# define VMOVU_MASK vmovdqu32 +# define VPMIN vpminud +# define VPTESTN vptestnmd +# define VPTEST vptestmd +# define VPCMPEQ vpcmpeqd +# define CHAR_SIZE 4 -# ifndef USE_AS_STRCAT +# define REP_MOVS rep movsd -/* zero register */ -# define XMMZERO xmm16 -# define YMMZERO ymm16 -# define YMM1 ymm17 - - .section .text.evex,"ax",@progbits -ENTRY (STRCPY) -# ifdef USE_AS_STRNCPY - mov %RDX_LP, %R8_LP - test %R8_LP, %R8_LP - jz L(ExitZero) -# endif - mov %rsi, %rcx -# ifndef USE_AS_STPCPY - mov %rdi, %rax /* save result */ -# endif +# define USE_WIDE_CHAR +# else +# define VMOVU_MASK vmovdqu8 +# define VPMIN vpminub +# define VPTESTN vptestnmb +# define VPTEST vptestmb +# define VPCMPEQ vpcmpeqb +# define CHAR_SIZE 1 - vpxorq %XMMZERO, %XMMZERO, %XMMZERO +# define REP_MOVS rep movsb # endif - and $((VEC_SIZE * 4) - 1), %ecx - cmp $(VEC_SIZE * 2), %ecx - jbe L(SourceStringAlignmentLessTwoVecSize) - - and $-VEC_SIZE, %rsi - and $(VEC_SIZE - 1), %ecx - - vpcmpb $0, (%rsi), %YMMZERO, %k0 - kmovd %k0, %edx - shr %cl, %rdx +# include "reg-macros.h" -# ifdef USE_AS_STRNCPY -# if defined USE_AS_STPCPY || defined USE_AS_STRCAT - mov $VEC_SIZE, %r10 - sub %rcx, %r10 - cmp %r10, %r8 -# else - mov $(VEC_SIZE + 1), %r10 - sub %rcx, %r10 - cmp %r10, %r8 -# endif - jbe L(CopyVecSizeTailCase2OrCase3) -# endif - test %edx, %edx - jnz L(CopyVecSizeTail) - - vpcmpb $0, VEC_SIZE(%rsi), %YMMZERO, %k1 - kmovd %k1, %edx -# ifdef USE_AS_STRNCPY - add $VEC_SIZE, %r10 - cmp %r10, %r8 - jbe L(CopyTwoVecSizeCase2OrCase3) -# endif - test %edx, %edx - jnz L(CopyTwoVecSize) - - VMOVU (%rsi, %rcx), %YMM2 /* copy VEC_SIZE bytes */ - VMOVU %YMM2, (%rdi) - -/* If source address alignment != destination address alignment */ - .p2align 4 -L(UnalignVecSizeBoth): - sub %rcx, %rdi -# ifdef USE_AS_STRNCPY - add %rcx, %r8 - sbb %rcx, %rcx - or %rcx, %r8 -# endif - mov $VEC_SIZE, %rcx - VMOVA (%rsi, %rcx), %YMM2 - VMOVU %YMM2, (%rdi, %rcx) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM2 - vpcmpb $0, %YMM2, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $(VEC_SIZE * 3), %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec2) +# ifdef USE_AS_STPCPY +# define END_REG rax # else - jnz L(CopyVecSize) +# define END_REG rdi, %rdx, CHAR_SIZE # endif - VMOVU %YMM2, (%rdi, %rcx) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM3 - vpcmpb $0, %YMM3, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec3) +# ifdef USE_AS_STRCAT +# define PAGE_ALIGN_REG edx +# define PAGE_ALIGN_REG_64 rdx # else - jnz L(CopyVecSize) +# define PAGE_ALIGN_REG eax +# define PAGE_ALIGN_REG_64 rax # endif - VMOVU %YMM3, (%rdi, %rcx) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM4 - vpcmpb $0, %YMM4, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec4) -# else - jnz L(CopyVecSize) -# endif +# define VZERO VMM(7) +# define VZERO_128 VMM_128(7) - VMOVU %YMM4, (%rdi, %rcx) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM2 - vpcmpb $0, %YMM2, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec2) -# else - jnz L(CopyVecSize) -# endif - VMOVU %YMM2, (%rdi, %rcx) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM2 - vpcmpb $0, %YMM2, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec2) -# else - jnz L(CopyVecSize) -# endif +# define PAGE_SIZE 4096 +# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) - VMOVA VEC_SIZE(%rsi, %rcx), %YMM3 - VMOVU %YMM2, (%rdi, %rcx) - vpcmpb $0, %YMM3, %YMMZERO, %k0 - kmovd %k0, %edx - add $VEC_SIZE, %rcx -# ifdef USE_AS_STRNCPY - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) -# endif - test %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec3) -# else - jnz L(CopyVecSize) -# endif - VMOVU %YMM3, (%rdi, %rcx) - mov %rsi, %rdx - lea VEC_SIZE(%rsi, %rcx), %rsi - and $-(VEC_SIZE * 4), %rsi - sub %rsi, %rdx - sub %rdx, %rdi -# ifdef USE_AS_STRNCPY - lea (VEC_SIZE * 8)(%r8, %rdx), %r8 -# endif -L(UnalignedFourVecSizeLoop): - VMOVA (%rsi), %YMM4 - VMOVA VEC_SIZE(%rsi), %YMM5 - VMOVA (VEC_SIZE * 2)(%rsi), %YMM6 - VMOVA (VEC_SIZE * 3)(%rsi), %YMM7 - vpminub %YMM5, %YMM4, %YMM2 - vpminub %YMM7, %YMM6, %YMM3 - vpminub %YMM2, %YMM3, %YMM2 - /* If K7 != 0, there is a null byte. */ - vpcmpb $0, %YMM2, %YMMZERO, %k7 - kmovd %k7, %edx -# ifdef USE_AS_STRNCPY - sub $(VEC_SIZE * 4), %r8 - jbe L(UnalignedLeaveCase2OrCase3) + .section SECTION(.text), "ax", @progbits +ENTRY(STRCPY) +# ifdef USE_AS_STRCAT + movq %rdi, %rax +# include "strcat-strlen-evex.h.S" # endif - test %edx, %edx - jnz L(UnalignedFourVecSizeLeave) - -L(UnalignedFourVecSizeLoop_start): - add $(VEC_SIZE * 4), %rdi - add $(VEC_SIZE * 4), %rsi - VMOVU %YMM4, -(VEC_SIZE * 4)(%rdi) - VMOVA (%rsi), %YMM4 - VMOVU %YMM5, -(VEC_SIZE * 3)(%rdi) - VMOVA VEC_SIZE(%rsi), %YMM5 - vpminub %YMM5, %YMM4, %YMM2 - VMOVU %YMM6, -(VEC_SIZE * 2)(%rdi) - VMOVA (VEC_SIZE * 2)(%rsi), %YMM6 - VMOVU %YMM7, -VEC_SIZE(%rdi) - VMOVA (VEC_SIZE * 3)(%rsi), %YMM7 - vpminub %YMM7, %YMM6, %YMM3 - vpminub %YMM2, %YMM3, %YMM2 - /* If K7 != 0, there is a null byte. */ - vpcmpb $0, %YMM2, %YMMZERO, %k7 - kmovd %k7, %edx -# ifdef USE_AS_STRNCPY - sub $(VEC_SIZE * 4), %r8 - jbe L(UnalignedLeaveCase2OrCase3) + + movl %esi, %PAGE_ALIGN_REG + andl $(PAGE_SIZE - 1), %PAGE_ALIGN_REG + cmpl $(PAGE_SIZE - VEC_SIZE), %PAGE_ALIGN_REG + ja L(page_cross) +L(page_cross_continue): + VMOVU (%rsi), %VMM(0) +# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT + movq %rdi, %rax # endif - test %edx, %edx - jz L(UnalignedFourVecSizeLoop_start) -L(UnalignedFourVecSizeLeave): - vpcmpb $0, %YMM4, %YMMZERO, %k1 - kmovd %k1, %edx - test %edx, %edx - jnz L(CopyVecSizeUnaligned_0) - vpcmpb $0, %YMM5, %YMMZERO, %k2 - kmovd %k2, %ecx - test %ecx, %ecx - jnz L(CopyVecSizeUnaligned_16) + /* Two short string implementations. One with traditional + branching approach and one with masked instructions (which + have potential for dramatically bad perf if dst splits a + page and is not in the TLB). */ +# if USE_EVEX_MASKED_STORE + VPTEST %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX +# ifdef USE_AS_WCSCPY + subl $((1 << CHAR_PER_VEC)- 1), %VRCX +# else + inc %VRCX +# endif + jz L(more_1x_vec) + KMOV %VRCX, %k1 + KXOR %k0, %k1, %k1 - vpcmpb $0, %YMM6, %YMMZERO, %k3 - kmovd %k3, %edx - test %edx, %edx - jnz L(CopyVecSizeUnaligned_32) - - vpcmpb $0, %YMM7, %YMMZERO, %k4 - kmovd %k4, %ecx - bsf %ecx, %edx - VMOVU %YMM4, (%rdi) - VMOVU %YMM5, VEC_SIZE(%rdi) - VMOVU %YMM6, (VEC_SIZE * 2)(%rdi) -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT -# ifdef USE_AS_STPCPY - lea (VEC_SIZE * 3)(%rdi, %rdx), %rax -# endif - VMOVU %YMM7, (VEC_SIZE * 3)(%rdi) - add $(VEC_SIZE - 1), %r8 - sub %rdx, %r8 - lea ((VEC_SIZE * 3) + 1)(%rdi, %rdx), %rdi - jmp L(StrncpyFillTailWithZero) -# else - add $(VEC_SIZE * 3), %rsi - add $(VEC_SIZE * 3), %rdi - jmp L(CopyVecSizeExit) -# endif + VMOVU_MASK %VMM(0), (%rdi){%k1} -/* If source address alignment == destination address alignment */ +# ifdef USE_AS_STPCPY + bsf %VRCX, %VRCX + leaq (%rdi, %rcx, CHAR_SIZE), %rax +# endif + ret -L(SourceStringAlignmentLessTwoVecSize): - VMOVU (%rsi), %YMM3 - VMOVU VEC_SIZE(%rsi), %YMM2 - vpcmpb $0, %YMM3, %YMMZERO, %k0 - kmovd %k0, %edx +# else + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jz L(more_1x_vec) -# ifdef USE_AS_STRNCPY -# if defined USE_AS_STPCPY || defined USE_AS_STRCAT - cmp $VEC_SIZE, %r8 + xorl %edx, %edx + bsf %VRCX, %VRDX +# ifdef USE_AS_STPCPY + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# endif + + /* Use mask bits in rcx to detect which copy we need. If the low + mask is zero then there must be a bit set in the upper half. + I.e if rcx != 0 and ecx == 0, then match must be upper 32 + bits so we use L(copy_32_63). */ +# if VEC_SIZE == 64 +# ifdef USE_AS_WCSCPY + testb %cl, %cl +# else + testl %ecx, %ecx +# endif + jz L(copy_32_63) +# endif + +# ifdef USE_AS_WCSCPY + testb $0xf, %cl # else - cmp $(VEC_SIZE + 1), %r8 + testw %cx, %cx # endif - jbe L(CopyVecSizeTail1Case2OrCase3) -# endif - test %edx, %edx - jnz L(CopyVecSizeTail1) + jz L(copy_16_31) - VMOVU %YMM3, (%rdi) - vpcmpb $0, %YMM2, %YMMZERO, %k0 - kmovd %k0, %edx -# ifdef USE_AS_STRNCPY -# if defined USE_AS_STPCPY || defined USE_AS_STRCAT - cmp $(VEC_SIZE * 2), %r8 +# ifdef USE_AS_WCSCPY + testb $0x3, %cl # else - cmp $((VEC_SIZE * 2) + 1), %r8 + testb %cl, %cl # endif - jbe L(CopyTwoVecSize1Case2OrCase3) -# endif - test %edx, %edx - jnz L(CopyTwoVecSize1) - - and $-VEC_SIZE, %rsi - and $(VEC_SIZE - 1), %ecx - jmp L(UnalignVecSizeBoth) + jz L(copy_8_15) -/*------End of main part with loops---------------------*/ -/* Case1 */ +# ifdef USE_AS_WCSCPY + vmovd %VMM_128(0), (%rdi) + /* No need to copy, we know its zero. */ + movl $0, (%END_REG) -# if (!defined USE_AS_STRNCPY) || (defined USE_AS_STRCAT) - .p2align 4 -L(CopyVecSize): - add %rcx, %rdi -# endif -L(CopyVecSizeTail): - add %rcx, %rsi -L(CopyVecSizeTail1): - bsf %edx, %edx -L(CopyVecSizeExit): - cmp $32, %edx - jae L(Exit32_63) - cmp $16, %edx - jae L(Exit16_31) - cmp $8, %edx - jae L(Exit8_15) - cmp $4, %edx - jae L(Exit4_7) - cmp $3, %edx - je L(Exit3) - cmp $1, %edx - ja L(Exit2) - je L(Exit1) - movb $0, (%rdi) -# ifdef USE_AS_STPCPY - lea (%rdi), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub $1, %r8 - lea 1(%rdi), %rdi - jnz L(StrncpyFillTailWithZero) -# endif ret +# else - .p2align 4 -L(CopyTwoVecSize1): - add $VEC_SIZE, %rsi - add $VEC_SIZE, %rdi -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub $VEC_SIZE, %r8 -# endif - jmp L(CopyVecSizeTail1) - - .p2align 4 -L(CopyTwoVecSize): - bsf %edx, %edx - add %rcx, %rsi - add $VEC_SIZE, %edx - sub %ecx, %edx - jmp L(CopyVecSizeExit) - - .p2align 4 -L(CopyVecSizeUnaligned_0): - bsf %edx, %edx -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT -# ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax -# endif - VMOVU %YMM4, (%rdi) - add $((VEC_SIZE * 4) - 1), %r8 - sub %rdx, %r8 - lea 1(%rdi, %rdx), %rdi - jmp L(StrncpyFillTailWithZero) -# else - jmp L(CopyVecSizeExit) -# endif + testb $0x7, %cl + jz L(copy_4_7) - .p2align 4 -L(CopyVecSizeUnaligned_16): - bsf %ecx, %edx - VMOVU %YMM4, (%rdi) -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT -# ifdef USE_AS_STPCPY - lea VEC_SIZE(%rdi, %rdx), %rax -# endif - VMOVU %YMM5, VEC_SIZE(%rdi) - add $((VEC_SIZE * 3) - 1), %r8 - sub %rdx, %r8 - lea (VEC_SIZE + 1)(%rdi, %rdx), %rdi - jmp L(StrncpyFillTailWithZero) -# else - add $VEC_SIZE, %rsi - add $VEC_SIZE, %rdi - jmp L(CopyVecSizeExit) -# endif - .p2align 4 -L(CopyVecSizeUnaligned_32): - bsf %edx, %edx - VMOVU %YMM4, (%rdi) - VMOVU %YMM5, VEC_SIZE(%rdi) -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT -# ifdef USE_AS_STPCPY - lea (VEC_SIZE * 2)(%rdi, %rdx), %rax -# endif - VMOVU %YMM6, (VEC_SIZE * 2)(%rdi) - add $((VEC_SIZE * 2) - 1), %r8 - sub %rdx, %r8 - lea ((VEC_SIZE * 2) + 1)(%rdi, %rdx), %rdi - jmp L(StrncpyFillTailWithZero) -# else - add $(VEC_SIZE * 2), %rsi - add $(VEC_SIZE * 2), %rdi - jmp L(CopyVecSizeExit) -# endif + test %edx, %edx + jz L(set_null_term) -# ifdef USE_AS_STRNCPY -# ifndef USE_AS_STRCAT - .p2align 4 -L(CopyVecSizeUnalignedVec6): - VMOVU %YMM6, (%rdi, %rcx) - jmp L(CopyVecSizeVecExit) - - .p2align 4 -L(CopyVecSizeUnalignedVec5): - VMOVU %YMM5, (%rdi, %rcx) - jmp L(CopyVecSizeVecExit) - - .p2align 4 -L(CopyVecSizeUnalignedVec4): - VMOVU %YMM4, (%rdi, %rcx) - jmp L(CopyVecSizeVecExit) - - .p2align 4 -L(CopyVecSizeUnalignedVec3): - VMOVU %YMM3, (%rdi, %rcx) - jmp L(CopyVecSizeVecExit) + /* NB: make this `vmovw` if support for AVX512-FP16 is added. + */ + vmovd %VMM_128(0), %esi + movw %si, (%rdi) + + .p2align 4,, 1 +L(set_null_term): + /* No need to copy, we know its zero. */ + movb $0, (%END_REG) + ret # endif -/* Case2 */ - - .p2align 4 -L(CopyVecSizeCase2): - add $VEC_SIZE, %r8 - add %rcx, %rdi - add %rcx, %rsi - bsf %edx, %edx - cmp %r8d, %edx - jb L(CopyVecSizeExit) - jmp L(StrncpyExit) - - .p2align 4 -L(CopyTwoVecSizeCase2): - add %rcx, %rsi - bsf %edx, %edx - add $VEC_SIZE, %edx - sub %ecx, %edx - cmp %r8d, %edx - jb L(CopyVecSizeExit) - jmp L(StrncpyExit) - -L(CopyVecSizeTailCase2): - add %rcx, %rsi - bsf %edx, %edx - cmp %r8d, %edx - jb L(CopyVecSizeExit) - jmp L(StrncpyExit) - -L(CopyVecSizeTail1Case2): - bsf %edx, %edx - cmp %r8d, %edx - jb L(CopyVecSizeExit) - jmp L(StrncpyExit) - -/* Case2 or Case3, Case3 */ - - .p2align 4 -L(CopyVecSizeCase2OrCase3): - test %rdx, %rdx - jnz L(CopyVecSizeCase2) -L(CopyVecSizeCase3): - add $VEC_SIZE, %r8 - add %rcx, %rdi - add %rcx, %rsi - jmp L(StrncpyExit) - - .p2align 4 -L(CopyTwoVecSizeCase2OrCase3): - test %rdx, %rdx - jnz L(CopyTwoVecSizeCase2) - add %rcx, %rsi - jmp L(StrncpyExit) - - .p2align 4 -L(CopyVecSizeTailCase2OrCase3): - test %rdx, %rdx - jnz L(CopyVecSizeTailCase2) - add %rcx, %rsi - jmp L(StrncpyExit) - - .p2align 4 -L(CopyTwoVecSize1Case2OrCase3): - add $VEC_SIZE, %rdi - add $VEC_SIZE, %rsi - sub $VEC_SIZE, %r8 -L(CopyVecSizeTail1Case2OrCase3): - test %rdx, %rdx - jnz L(CopyVecSizeTail1Case2) - jmp L(StrncpyExit) +# if VEC_SIZE == 64 + .p2align 4,, 6 +L(copy_32_63): + VMOVU -(32 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %VMM_256(1) + VMOVU %VMM_256(0), (%rdi) + VMOVU %VMM_256(1), -(32 - CHAR_SIZE)(%END_REG) + ret +# endif + + + .p2align 4,, 6 +L(copy_16_31): + /* Use xmm1 explicitly here as it won't require a `vzeroupper` + and will save code size. */ + vmovdqu -(16 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %xmm1 + VMOVU %VMM_128(0), (%rdi) + vmovdqu %xmm1, -(16 - CHAR_SIZE)(%END_REG) + ret + + .p2align 4,, 8 +L(copy_8_15): +# ifdef USE_AS_WCSCPY + movl -(8 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %ecx +# else + movq -(8 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %rcx +# endif + vmovq %VMM_128(0), (%rdi) + movq %rcx, -(8 - CHAR_SIZE)(%END_REG) + ret # endif -/*------------End labels regarding with copying 1-VEC_SIZE bytes--and 1-(VEC_SIZE*2) bytes----*/ - .p2align 4 -L(Exit1): - movzwl (%rsi), %edx - mov %dx, (%rdi) -# ifdef USE_AS_STPCPY - lea 1(%rdi), %rax +# ifndef USE_AS_WCSCPY + .p2align 4,, 12 +L(copy_4_7): + movl -(4 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %ecx + vmovd %VMM_128(0), (%rdi) + movl %ecx, -(4 - CHAR_SIZE)(%END_REG) + ret # endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub $2, %r8 - lea 2(%rdi), %rdi - jnz L(StrncpyFillTailWithZero) + + + .p2align 4,, 8 +L(more_1x_vec): +# if defined USE_AS_STPCPY || defined USE_AS_STRCAT + VMOVU %VMM(0), (%rdi) # endif - ret + subq %rsi, %rdi + andq $-(VEC_SIZE), %rsi + addq %rsi, %rdi + VMOVA (VEC_SIZE * 1)(%rsi), %VMM(1) - .p2align 4 -L(Exit2): - movzwl (%rsi), %ecx - mov %cx, (%rdi) - movb $0, 2(%rdi) + /* Ideally we store after moves to minimize impact of potential + false-dependencies. */ +# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT + VMOVU %VMM(0), (%rax) +# endif + + VPTESTN %VMM(1), %VMM(1), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x1) + + VMOVA (VEC_SIZE * 2)(%rsi), %VMM(2) + VMOVU %VMM(1), VEC_SIZE(%rdi) + + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x2) + + VMOVA (VEC_SIZE * 3)(%rsi), %VMM(3) + VMOVU %VMM(2), (VEC_SIZE * 2)(%rdi) + + VPTESTN %VMM(3), %VMM(3), %k0 + KMOV %k0, %VRDX + test %VRDX, %VRDX + jnz L(ret_vec_x3) + + VMOVA (VEC_SIZE * 4)(%rsi), %VMM(4) + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + VPTESTN %VMM(4), %VMM(4), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x4) + + VMOVU %VMM(4), (VEC_SIZE * 4)(%rdi) + + + /* Align for 4x loop. */ + subq %rsi, %rdi + + /* + VEC_SIZE * 5 because we never added the original VEC_SIZE + we covered before aligning. */ + subq $-(VEC_SIZE * 5), %rsi + andq $-(VEC_SIZE * 4), %rsi + + + /* Load first half of the loop before entry. */ + VMOVA (VEC_SIZE * 0 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(3) + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + KORTEST %k2, %k4 + jnz L(loop_4x_done) + + .p2align 4,, 11 +L(loop_4x_vec): + + VMOVU %VMM(0), (VEC_SIZE * 0 + 0)(%rdi, %rsi) + VMOVU %VMM(1), (VEC_SIZE * 1 + 0)(%rdi, %rsi) + VMOVU %VMM(2), (VEC_SIZE * 2 + 0)(%rdi, %rsi) + VMOVU %VMM(3), (VEC_SIZE * 3 + 0)(%rdi, %rsi) + + subq $(VEC_SIZE * -4), %rsi + + VMOVA (VEC_SIZE * 0 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(3) + + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + KORTEST %k2, %k4 + jz L(loop_4x_vec) + +L(loop_4x_done): + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + /* Restore rdi (%rdi). */ + addq %rsi, %rdi + test %VRCX, %VRCX + jnz L(ret_vec_x0_end) + VMOVU %VMM(0), (VEC_SIZE * 0 + 0)(%rdi) + + KMOV %k2, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x1) + VMOVU %VMM(1), (VEC_SIZE * 1 + 0)(%rdi) + + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x2) + VMOVU %VMM(2), (VEC_SIZE * 2 + 0)(%rdi) + /* Place L(ret_vec_x4) here to save code size. We get a + meaningfuly benefit doing this for stpcpy. */ + KMOV %k4, %VRDX +L(ret_vec_x3): + bsf %VRDX, %VRDX + VMOVU ((VEC_SIZE * 3)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 3 + 0)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) # ifdef USE_AS_STPCPY - lea 2(%rdi), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub $3, %r8 - lea 3(%rdi), %rdi - jnz L(StrncpyFillTailWithZero) + leaq (VEC_SIZE * 3 + 0)(%rdi, %rdx, CHAR_SIZE), %rax # endif +L(return_end): ret - .p2align 4 -L(Exit3): - mov (%rsi), %edx - mov %edx, (%rdi) + .p2align 4,, 6 +L(ret_vec_x0_end): + bsf %VRCX, %VRCX # ifdef USE_AS_STPCPY - lea 3(%rdi), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub $4, %r8 - lea 4(%rdi), %rdi - jnz L(StrncpyFillTailWithZero) + leaq (%rdi, %rcx, CHAR_SIZE), %rax # endif + inc %VRCX + VMOVU (-(VEC_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), (-(VEC_SIZE))(%rdi, %rcx, CHAR_SIZE) ret - .p2align 4 -L(Exit4_7): - mov (%rsi), %ecx - mov %ecx, (%rdi) - mov -3(%rsi, %rdx), %ecx - mov %ecx, -3(%rdi, %rdx) + .p2align 4,, 8 +L(ret_vec_x1): + bsf %VRCX, %VRCX + VMOVU (VEC_SIZE -(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), (VEC_SIZE -(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx, CHAR_SIZE) # ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub %rdx, %r8 - sub $1, %r8 - lea 1(%rdi, %rdx), %rdi - jnz L(StrncpyFillTailWithZero) + leaq VEC_SIZE(%rdi, %rcx, CHAR_SIZE), %rax # endif ret - .p2align 4 -L(Exit8_15): - mov (%rsi), %rcx - mov -7(%rsi, %rdx), %r9 - mov %rcx, (%rdi) - mov %r9, -7(%rdi, %rdx) + .p2align 4,, 4 +L(ret_vec_x2): + bsf %VRCX, %VRCX + VMOVU ((VEC_SIZE * 2)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 2)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx, CHAR_SIZE) # ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub %rdx, %r8 - sub $1, %r8 - lea 1(%rdi, %rdx), %rdi - jnz L(StrncpyFillTailWithZero) + leaq (VEC_SIZE * 2)(%rdi, %rcx, CHAR_SIZE), %rax # endif ret - .p2align 4 -L(Exit16_31): - VMOVU (%rsi), %XMM2 - VMOVU -15(%rsi, %rdx), %XMM3 - VMOVU %XMM2, (%rdi) - VMOVU %XMM3, -15(%rdi, %rdx) + /* ret_vec_x3 reuses return code after the loop. */ + .p2align 4,, 6 +L(ret_vec_x4): + bsf %VRCX, %VRCX + VMOVU ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx, CHAR_SIZE) # ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax -# endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub %rdx, %r8 - sub $1, %r8 - lea 1(%rdi, %rdx), %rdi - jnz L(StrncpyFillTailWithZero) + leaq (VEC_SIZE * 4)(%rdi, %rcx, CHAR_SIZE), %rax # endif ret - .p2align 4 -L(Exit32_63): - VMOVU (%rsi), %YMM2 - VMOVU -31(%rsi, %rdx), %YMM3 - VMOVU %YMM2, (%rdi) - VMOVU %YMM3, -31(%rdi, %rdx) -# ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax + + .p2align 4,, 4 +L(page_cross): +# ifndef USE_AS_STRCAT + vpxorq %VZERO_128, %VZERO_128, %VZERO_128 # endif -# if defined USE_AS_STRNCPY && !defined USE_AS_STRCAT - sub %rdx, %r8 - sub $1, %r8 - lea 1(%rdi, %rdx), %rdi - jnz L(StrncpyFillTailWithZero) + movq %rsi, %rcx + andq $(VEC_SIZE * -1), %rcx + + VPCMPEQ (%rcx), %VZERO, %k0 + KMOV %k0, %VRCX +# ifdef USE_AS_WCSCPY + andl $(VEC_SIZE - 1), %PAGE_ALIGN_REG + shrl $2, %PAGE_ALIGN_REG # endif - ret + shrx %VGPR(PAGE_ALIGN_REG_64), %VRCX, %VRCX -# ifdef USE_AS_STRNCPY +# if USE_MOVSB_IN_PAGE_CROSS + /* Optimizing more aggressively for space as this is very cold + code. This saves 2x cache lines. */ - .p2align 4 -L(StrncpyExit1): - movzbl (%rsi), %edx - mov %dl, (%rdi) -# ifdef USE_AS_STPCPY - lea 1(%rdi), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, 1(%rdi) + /* This adds once to the later result which will get correct + copy bounds. NB: this can never zero-out a non-zero RCX as + to be in the page cross case rsi cannot be aligned and we + already right-shift rcx by the misalignment. */ + shl %VRCX + jz L(page_cross_continue) +# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT + movq %rdi, %rax # endif - ret + bsf %VRCX, %VRCX + REP_MOVS - .p2align 4 -L(StrncpyExit2): - movzwl (%rsi), %edx - mov %dx, (%rdi) # ifdef USE_AS_STPCPY - lea 2(%rdi), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, 2(%rdi) + leaq -CHAR_SIZE(%rdi), %rax # endif ret - .p2align 4 -L(StrncpyExit3_4): - movzwl (%rsi), %ecx - movzwl -2(%rsi, %r8), %edx - mov %cx, (%rdi) - mov %dx, -2(%rdi, %r8) -# ifdef USE_AS_STPCPY - lea (%rdi, %r8), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi, %r8) -# endif - ret - .p2align 4 -L(StrncpyExit5_8): - mov (%rsi), %ecx - mov -4(%rsi, %r8), %edx - mov %ecx, (%rdi) - mov %edx, -4(%rdi, %r8) -# ifdef USE_AS_STPCPY - lea (%rdi, %r8), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi, %r8) -# endif - ret +# else + /* Check if we found zero-char before end of page. */ + test %VRCX, %VRCX + jz L(page_cross_continue) - .p2align 4 -L(StrncpyExit9_16): - mov (%rsi), %rcx - mov -8(%rsi, %r8), %rdx - mov %rcx, (%rdi) - mov %rdx, -8(%rdi, %r8) -# ifdef USE_AS_STPCPY - lea (%rdi, %r8), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi, %r8) -# endif - ret + /* Traditional copy case, essentially same as used in non-page- + cross case but since we can't reuse VMM(0) we need twice as + many loads from rsi. */ - .p2align 4 -L(StrncpyExit17_32): - VMOVU (%rsi), %XMM2 - VMOVU -16(%rsi, %r8), %XMM3 - VMOVU %XMM2, (%rdi) - VMOVU %XMM3, -16(%rdi, %r8) -# ifdef USE_AS_STPCPY - lea (%rdi, %r8), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi, %r8) +# ifndef USE_AS_STRCAT + xorl %edx, %edx # endif - ret - - .p2align 4 -L(StrncpyExit33_64): - /* 0/32, 31/16 */ - VMOVU (%rsi), %YMM2 - VMOVU -VEC_SIZE(%rsi, %r8), %YMM3 - VMOVU %YMM2, (%rdi) - VMOVU %YMM3, -VEC_SIZE(%rdi, %r8) + /* Dependency on rdi must already have been satisfied. */ + bsf %VRCX, %VRDX # ifdef USE_AS_STPCPY - lea (%rdi, %r8), %rax + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# elif !defined USE_AS_STRCAT + movq %rdi, %rax # endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi, %r8) -# endif - ret - .p2align 4 -L(StrncpyExit65): - /* 0/32, 32/32, 64/1 */ - VMOVU (%rsi), %YMM2 - VMOVU 32(%rsi), %YMM3 - mov 64(%rsi), %cl - VMOVU %YMM2, (%rdi) - VMOVU %YMM3, 32(%rdi) - mov %cl, 64(%rdi) -# ifdef USE_AS_STPCPY - lea 65(%rdi), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, 65(%rdi) +# if VEC_SIZE == 64 +# ifdef USE_AS_WCSCPY + testb %cl, %cl +# else + test %ecx, %ecx +# endif + jz L(page_cross_copy_32_63) # endif - ret - -# ifndef USE_AS_STRCAT - .p2align 4 -L(Fill1): - mov %dl, (%rdi) - ret +# ifdef USE_AS_WCSCPY + testb $0xf, %cl +# else + testw %cx, %cx +# endif + jz L(page_cross_copy_16_31) - .p2align 4 -L(Fill2): - mov %dx, (%rdi) - ret +# ifdef USE_AS_WCSCPY + testb $0x3, %cl +# else + testb %cl, %cl +# endif + jz L(page_cross_copy_8_15) - .p2align 4 -L(Fill3_4): - mov %dx, (%rdi) - mov %dx, -2(%rdi, %r8) +# ifdef USE_AS_WCSCPY + movl (%rsi), %esi + movl %esi, (%rdi) + movl $0, (%END_REG) ret +# else - .p2align 4 -L(Fill5_8): - mov %edx, (%rdi) - mov %edx, -4(%rdi, %r8) - ret + testb $0x7, %cl + jz L(page_cross_copy_4_7) - .p2align 4 -L(Fill9_16): - mov %rdx, (%rdi) - mov %rdx, -8(%rdi, %r8) + test %edx, %edx + jz L(page_cross_set_null_term) + movzwl (%rsi), %ecx + movw %cx, (%rdi) +L(page_cross_set_null_term): + movb $0, (%END_REG) ret - .p2align 4 -L(Fill17_32): - VMOVU %XMMZERO, (%rdi) - VMOVU %XMMZERO, -16(%rdi, %r8) - ret - .p2align 4 -L(CopyVecSizeUnalignedVec2): - VMOVU %YMM2, (%rdi, %rcx) - - .p2align 4 -L(CopyVecSizeVecExit): - bsf %edx, %edx - add $(VEC_SIZE - 1), %r8 - add %rcx, %rdi -# ifdef USE_AS_STPCPY - lea (%rdi, %rdx), %rax -# endif - sub %rdx, %r8 - lea 1(%rdi, %rdx), %rdi - - .p2align 4 -L(StrncpyFillTailWithZero): - xor %edx, %edx - sub $VEC_SIZE, %r8 - jbe L(StrncpyFillExit) - - VMOVU %YMMZERO, (%rdi) - add $VEC_SIZE, %rdi - - mov %rdi, %rsi - and $(VEC_SIZE - 1), %esi - sub %rsi, %rdi - add %rsi, %r8 - sub $(VEC_SIZE * 4), %r8 - jb L(StrncpyFillLessFourVecSize) - -L(StrncpyFillLoopVmovdqa): - VMOVA %YMMZERO, (%rdi) - VMOVA %YMMZERO, VEC_SIZE(%rdi) - VMOVA %YMMZERO, (VEC_SIZE * 2)(%rdi) - VMOVA %YMMZERO, (VEC_SIZE * 3)(%rdi) - add $(VEC_SIZE * 4), %rdi - sub $(VEC_SIZE * 4), %r8 - jae L(StrncpyFillLoopVmovdqa) - -L(StrncpyFillLessFourVecSize): - add $(VEC_SIZE * 2), %r8 - jl L(StrncpyFillLessTwoVecSize) - VMOVA %YMMZERO, (%rdi) - VMOVA %YMMZERO, VEC_SIZE(%rdi) - add $(VEC_SIZE * 2), %rdi - sub $VEC_SIZE, %r8 - jl L(StrncpyFillExit) - VMOVA %YMMZERO, (%rdi) - add $VEC_SIZE, %rdi - jmp L(Fill) - - .p2align 4 -L(StrncpyFillLessTwoVecSize): - add $VEC_SIZE, %r8 - jl L(StrncpyFillExit) - VMOVA %YMMZERO, (%rdi) - add $VEC_SIZE, %rdi - jmp L(Fill) - - .p2align 4 -L(StrncpyFillExit): - add $VEC_SIZE, %r8 -L(Fill): - cmp $17, %r8d - jae L(Fill17_32) - cmp $9, %r8d - jae L(Fill9_16) - cmp $5, %r8d - jae L(Fill5_8) - cmp $3, %r8d - jae L(Fill3_4) - cmp $1, %r8d - ja L(Fill2) - je L(Fill1) + .p2align 4,, 4 +L(page_cross_copy_4_7): + movl (%rsi), %ecx + movl -(4 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %esi + movl %ecx, (%rdi) + movl %esi, -(4 - CHAR_SIZE)(%END_REG) ret - -/* end of ifndef USE_AS_STRCAT */ # endif - .p2align 4 -L(UnalignedLeaveCase2OrCase3): - test %rdx, %rdx - jnz L(UnalignedFourVecSizeLeaveCase2) -L(UnalignedFourVecSizeLeaveCase3): - lea (VEC_SIZE * 4)(%r8), %rcx - and $-VEC_SIZE, %rcx - add $(VEC_SIZE * 3), %r8 - jl L(CopyVecSizeCase3) - VMOVU %YMM4, (%rdi) - sub $VEC_SIZE, %r8 - jb L(CopyVecSizeCase3) - VMOVU %YMM5, VEC_SIZE(%rdi) - sub $VEC_SIZE, %r8 - jb L(CopyVecSizeCase3) - VMOVU %YMM6, (VEC_SIZE * 2)(%rdi) - sub $VEC_SIZE, %r8 - jb L(CopyVecSizeCase3) - VMOVU %YMM7, (VEC_SIZE * 3)(%rdi) -# ifdef USE_AS_STPCPY - lea (VEC_SIZE * 4)(%rdi), %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (VEC_SIZE * 4)(%rdi) -# endif +# if VEC_SIZE == 64 + .p2align 4,, 4 +L(page_cross_copy_32_63): + VMOVU (%rsi), %VMM_256(0) + VMOVU -(32 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %VMM_256(1) + VMOVU %VMM_256(0), (%rdi) + VMOVU %VMM_256(1), -(32 - CHAR_SIZE)(%END_REG) ret - - .p2align 4 -L(UnalignedFourVecSizeLeaveCase2): - xor %ecx, %ecx - vpcmpb $0, %YMM4, %YMMZERO, %k1 - kmovd %k1, %edx - add $(VEC_SIZE * 3), %r8 - jle L(CopyVecSizeCase2OrCase3) - test %edx, %edx -# ifndef USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec4) -# else - jnz L(CopyVecSize) -# endif - vpcmpb $0, %YMM5, %YMMZERO, %k2 - kmovd %k2, %edx - VMOVU %YMM4, (%rdi) - add $VEC_SIZE, %rcx - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) - test %edx, %edx -# ifndef USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec5) -# else - jnz L(CopyVecSize) # endif - vpcmpb $0, %YMM6, %YMMZERO, %k3 - kmovd %k3, %edx - VMOVU %YMM5, VEC_SIZE(%rdi) - add $VEC_SIZE, %rcx - sub $VEC_SIZE, %r8 - jbe L(CopyVecSizeCase2OrCase3) - test %edx, %edx -# ifndef USE_AS_STRCAT - jnz L(CopyVecSizeUnalignedVec6) -# else - jnz L(CopyVecSize) -# endif - - vpcmpb $0, %YMM7, %YMMZERO, %k4 - kmovd %k4, %edx - VMOVU %YMM6, (VEC_SIZE * 2)(%rdi) - lea VEC_SIZE(%rdi, %rcx), %rdi - lea VEC_SIZE(%rsi, %rcx), %rsi - bsf %edx, %edx - cmp %r8d, %edx - jb L(CopyVecSizeExit) -L(StrncpyExit): - cmp $65, %r8d - je L(StrncpyExit65) - cmp $33, %r8d - jae L(StrncpyExit33_64) - cmp $17, %r8d - jae L(StrncpyExit17_32) - cmp $9, %r8d - jae L(StrncpyExit9_16) - cmp $5, %r8d - jae L(StrncpyExit5_8) - cmp $3, %r8d - jae L(StrncpyExit3_4) - cmp $1, %r8d - ja L(StrncpyExit2) - je L(StrncpyExit1) -# ifdef USE_AS_STPCPY - mov %rdi, %rax -# endif -# ifdef USE_AS_STRCAT - movb $0, (%rdi) -# endif + .p2align 4,, 4 +L(page_cross_copy_16_31): + vmovdqu (%rsi), %xmm0 + vmovdqu -(16 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %xmm1 + vmovdqu %xmm0, (%rdi) + vmovdqu %xmm1, -(16 - CHAR_SIZE)(%END_REG) ret - .p2align 4 -L(ExitZero): -# ifndef USE_AS_STRCAT - mov %rdi, %rax -# endif + .p2align 4,, 4 +L(page_cross_copy_8_15): + movq (%rsi), %rcx + movq -(8 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %rsi + movq %rcx, (%rdi) + movq %rsi, -(8 - CHAR_SIZE)(%END_REG) ret - -# endif - -# ifndef USE_AS_STRCAT -END (STRCPY) -# else -END (STRCAT) # endif +END(STRCPY) #endif diff --git a/sysdeps/x86_64/multiarch/strncat-evex.S b/sysdeps/x86_64/multiarch/strncat-evex.S index 203a19b..bced4e8 100644 --- a/sysdeps/x86_64/multiarch/strncat-evex.S +++ b/sysdeps/x86_64/multiarch/strncat-evex.S @@ -1,7 +1,520 @@ -#ifndef STRNCAT -# define STRNCAT __strncat_evex -#endif +/* {wcs|str}ncat with 256/512-bit EVEX. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (4) + + /* Use evex-masked stores for small sizes. Turned off at the + moment. */ +# define USE_EVEX_MASKED_STORE 0 + +# include <sysdep.h> + +# ifndef VEC_SIZE +# include "x86-evex256-vecs.h" +# endif + +# ifndef STRNCAT +# define STRNCAT __strncat_evex +# endif + + +# ifdef USE_AS_WCSCPY +# define MOVCHAR movl +# define VMOVU_MASK vmovdqu32 +# define VPMIN vpminud +# define VPTESTN vptestnmd +# define VPTEST vptestmd +# define VPCMPEQ vpcmpeqd +# define CHAR_SIZE 4 + +# define REP_MOVS rep movsd + +# define VMASK_REG VR10 +# define FIND_FIRST_ONE(src, dst) movl $CHAR_PER_VEC, %dst; bsf %src, %dst + +# define USE_WIDE_CHAR +# else +# define MOVCHAR movb +# define VMOVU_MASK vmovdqu8 +# define VPMIN vpminub +# define VPTESTN vptestnmb +# define VPTEST vptestmb +# define VPCMPEQ vpcmpeqb +# define CHAR_SIZE 1 + +# define REP_MOVS rep movsb + +# define VMASK_REG VRCX +# define FIND_FIRST_ONE(src, dst) tzcnt %src, %dst + +# endif + +# include "strncpy-or-cat-overflow-def.h" + +# include "reg-macros.h" + + +# define VZERO VMM(7) +# define VZERO_128 VMM_128(7) + +# define PAGE_SIZE 4096 +# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) + + .section SECTION(.text), "ax", @progbits +ENTRY(STRNCAT) + movq %rdi, %rax + + /* NB: It's safe to filter out zero-length strings WITHOUT + setting null-term. Destination MUST be a null-terminated + string so essentially the work is already done. */ +# ifdef USE_AS_WCSCPY + leaq -1(%rdx), %rcx + shrq $56, %rcx + jnz L(zero_len) +# else + test %rdx, %rdx + jle L(zero_len) +# endif + +# include "strcat-strlen-evex.h.S" + + movl %esi, %ecx + andl $(PAGE_SIZE - 1), %ecx + cmpl $(PAGE_SIZE - VEC_SIZE), %ecx + ja L(page_cross) +L(page_cross_continue): + VMOVU (%rsi), %VMM(0) + VPTESTN %VMM(0), %VMM(0), %k0 + + /* If USE_EVEX_MASK_STORE is enabled then we just handle length + <= CHAR_PER_VEC with masked instructions (which have + potential for dramatically bad perf if dst splits a page and + is not in the TLB). */ +# if USE_EVEX_MASKED_STORE + KMOV %k0, %VRCX + FIND_FIRST_ONE (VRCX, VR8) + cmpq %r8, %rdx + jbe L(less_1x_vec) + + test %VRCX, %VRCX + jz L(more_1x_vec) + + blsmsk %VRCX, %VRCX + KMOV %VRCX, %k1 + VMOVU_MASK %VMM(0), (%rdi){%k1} + ret + +L(less_1x_vec): + mov $-1, %VRCX + bzhi %VRDX, %VRCX, %VRCX + KMOV %VRCX, %k1 + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + VMOVU_MASK %VMM(0), (%rdi){%k1} + + ret +# else + KMOV %k0, %VMASK_REG + /* tzcnt for strncat and `movl $CHAR_PER_VEC, %VRCX; bsf + %VMASK_REG, %VRCX` for wcsncat. */ + FIND_FIRST_ONE (VMASK_REG, VRCX) + cmpq %rcx, %rdx + jbe L(less_1x_vec) + + /* If there were no zero-CHARs (rcx was zero before + FIND_FIRST_ONE), then ecx will be $CHAR_PER_VEC. */ + cmpl $CHAR_PER_VEC, %ecx + je L(more_1x_vec) + + movl %ecx, %edx + +L(less_1x_vec): +# if VEC_SIZE == 64 + cmpl $(32 / CHAR_SIZE), %edx + jae L(copy_32_63) +# endif + + cmpl $(16 / CHAR_SIZE), %edx + jae L(copy_16_31) + + + cmpl $(8 / CHAR_SIZE), %edx + jae L(copy_8_15) + +# ifdef USE_AS_WCSCPY + vmovd %VMM_128(0), (%rdi) + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + ret +# else + + cmpl $4, %edx + jae L(copy_4_7) + + movzbl (%rsi), %ecx + cmpl $1, %edx + jbe L(set_null_term) + + movzwl 1(%rsi), %esi + movw %si, 1(%rdi) + + .p2align 4,, 1 +L(set_null_term): + movb %cl, (%rdi) + MOVCHAR $0, (%rdi, %rdx) + ret +# endif + +# if VEC_SIZE == 64 + .p2align 4,, 6 +L(copy_32_63): + VMOVU -(32)(%rsi, %rdx, CHAR_SIZE), %VMM_256(1) + VMOVU %VMM_256(0), (%rdi) + VMOVU %VMM_256(1), -(32)(%rdi, %rdx, CHAR_SIZE) + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + ret +# endif + .p2align 4,, 6 +L(copy_16_31): + /* Use xmm1 explicitly here as it won't require a `vzeroupper` + and will save code size. */ + vmovdqu -(16)(%rsi, %rdx, CHAR_SIZE), %xmm1 + VMOVU %VMM_128(0), (%rdi) + vmovdqu %xmm1, -(16)(%rdi, %rdx, CHAR_SIZE) + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + ret + + .p2align 4,, 2 +L(copy_8_15): + movq -(8)(%rsi, %rdx, CHAR_SIZE), %rcx + vmovq %VMM_128(0), (%rdi) + movq %rcx, -(8)(%rdi, %rdx, CHAR_SIZE) + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + ret + +# ifndef USE_AS_WCSCPY + .p2align 4,, 12 +L(copy_4_7): + movl -(4)(%rsi, %rdx, CHAR_SIZE), %ecx + vmovd %VMM_128(0), (%rdi) + movl %ecx, -(4)(%rdi, %rdx, CHAR_SIZE) + MOVCHAR $0, (%rdi, %rdx, CHAR_SIZE) + ret +# endif + +# endif + .p2align 4,, 4 +L(zero_len): +# ifdef USE_AS_WCSCPY + test %rdx, %rdx +# endif + jne OVERFLOW_STRCAT + ret -#define USE_AS_STRNCAT -#define STRCAT STRNCAT -#include "strcat-evex.S" + .p2align 4,, 8 +L(more_1x_vec): + VMOVU %VMM(0), (%rdi) + + /* We are going to align rsi here so will need to be able to re- + adjust rdi/rdx afterwords. NB: We filtered out huge lengths + so rsi + rdx * CHAR_SIZE cannot overflow. */ + + leaq (VEC_SIZE * -1)(%rsi, %rdx, CHAR_SIZE), %rdx + subq %rsi, %rdi + andq $-(VEC_SIZE), %rsi +L(loop_last_4x_vec): + addq %rsi, %rdi + subq %rsi, %rdx +# ifdef USE_AS_WCSCPY + shrq $2, %rdx +# endif + + /* Will need this regardless. */ + VMOVA (VEC_SIZE * 1)(%rsi), %VMM(1) + VPTESTN %VMM(1), %VMM(1), %k0 + KMOV %k0, %VMASK_REG + + cmpq $(CHAR_PER_VEC * 2), %rdx + ja L(more_2x_vec) + +L(last_2x_vec): + FIND_FIRST_ONE (VMASK_REG, VRCX) + cmpl %ecx, %edx + jbe L(ret_vec_x1_len) + + /* If there were no zero-CHARs (rcx was zero before + FIND_FIRST_ONE), then ecx will be $CHAR_PER_VEC. */ + cmpl $CHAR_PER_VEC, %ecx + jne L(ret_vec_x1) + + VMOVA (VEC_SIZE * 2)(%rsi), %VMM(2) + VMOVU %VMM(1), (VEC_SIZE * 1)(%rdi) + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + addl $-CHAR_PER_VEC, %edx + bzhi %VRDX, %VRCX, %VR8 + jz L(ret_vec_x2_len) +L(ret_vec_x2): + bsf %VRCX, %VRDX +L(ret_vec_x2_len): + VMOVU (VEC_SIZE * 2 -(VEC_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + MOVCHAR $0, (VEC_SIZE * 2)(%rdi, %rdx, CHAR_SIZE) + VMOVU %VMM(0), (VEC_SIZE * 2 -(VEC_SIZE))(%rdi, %rdx, CHAR_SIZE) + ret + + .p2align 4,, 4 +L(ret_vec_x1_len): + movl %edx, %ecx +L(ret_vec_x1): + VMOVU (VEC_SIZE -(VEC_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + MOVCHAR $0, (VEC_SIZE)(%rdi, %rcx, CHAR_SIZE) + VMOVU %VMM(0), (VEC_SIZE-(VEC_SIZE))(%rdi, %rcx, CHAR_SIZE) + VZEROUPPER_RETURN + + + .p2align 4,, 8 +L(last_4x_vec): + addl $-(CHAR_PER_VEC * 4), %edx + VMOVA (VEC_SIZE * 5)(%rsi), %VMM(1) + VPTESTN %VMM(1), %VMM(1), %k0 + KMOV %k0, %VMASK_REG + subq $-(VEC_SIZE * 4), %rsi + subq $-(VEC_SIZE * 4), %rdi + cmpl $(CHAR_PER_VEC * 2), %edx + jbe L(last_2x_vec) + .p2align 4,, 8 +L(more_2x_vec): +# ifdef USE_AS_WCSCPY + xorl %ecx, %ecx +# endif + bsf %VMASK_REG, %VRCX + jnz L(ret_vec_x1) + + VMOVA (VEC_SIZE * 2)(%rsi), %VMM(2) + VMOVU %VMM(1), (VEC_SIZE * 1)(%rdi) + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x2) + + VMOVA (VEC_SIZE * 3)(%rsi), %VMM(3) + VMOVU %VMM(2), (VEC_SIZE * 2)(%rdi) + VPTESTN %VMM(3), %VMM(3), %k0 + KMOV %k0, %VMASK_REG + + cmpq $(CHAR_PER_VEC * 4), %rdx + ja L(more_4x_vec) + + /* Adjust length before going to L(ret_vec_x3_len) or + L(ret_vec_x3). */ + addl $(CHAR_PER_VEC * -2), %edx + + FIND_FIRST_ONE (VMASK_REG, VRCX) + cmpl %ecx, %edx + jbe L(ret_vec_x3_len) + + /* If there were no zero-CHARs (rcx was zero before + FIND_FIRST_ONE), then ecx will be $CHAR_PER_VEC. */ + cmpl $CHAR_PER_VEC, %ecx + jne L(ret_vec_x3) + + VMOVA (VEC_SIZE * 4)(%rsi), %VMM(4) + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + VPTESTN %VMM(4), %VMM(4), %k0 + KMOV %k0, %VRCX + addl $-CHAR_PER_VEC, %edx + bzhi %VRDX, %VRCX, %VR8 + jz L(ret_vec_x4_len) +L(ret_vec_x4): + bsf %VRCX, %VRDX +L(ret_vec_x4_len): + VMOVU (VEC_SIZE * 4 -(VEC_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + MOVCHAR $0, (VEC_SIZE * 4)(%rdi, %rdx, CHAR_SIZE) + VMOVU %VMM(0), (VEC_SIZE * 4 -(VEC_SIZE))(%rdi, %rdx, CHAR_SIZE) + ret + + .p2align 4,, 4 +L(ret_vec_x3_len): + movl %edx, %ecx +L(ret_vec_x3): + VMOVU (VEC_SIZE * 3 -(VEC_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + MOVCHAR $0, (VEC_SIZE * 3)(%rdi, %rcx, CHAR_SIZE) + VMOVU %VMM(0), (VEC_SIZE * 3-(VEC_SIZE))(%rdi, %rcx, CHAR_SIZE) + ret + + .p2align 4,, 8 +L(more_4x_vec): +# ifdef USE_AS_WCSCPY + xorl %ecx, %ecx +# endif + bsf %VMASK_REG, %VRCX + jnz L(ret_vec_x3) + + VMOVA (VEC_SIZE * 4)(%rsi), %VMM(4) + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + VPTESTN %VMM(4), %VMM(4), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x4) + + VMOVU %VMM(4), (VEC_SIZE * 4)(%rdi) + + /* Check if we are near the end before aligning. */ + cmpq $(CHAR_PER_VEC * 8), %rdx + jbe L(last_4x_vec) + + + /* Add rsi to rdx (length) before aligning rsi. NB: Since we + filtered out huge lengths this cannot overflow. */ +# ifdef USE_AS_WCSCPY + leaq (%rsi, %rdx, CHAR_SIZE), %rdx +# else + addq %rsi, %rdx +# endif + + /* Subtract rsi from rdi before aligning (add back will have + correct rdi for aligned rsi). */ + subq %rsi, %rdi + subq $-(VEC_SIZE * 5), %rsi + andq $(VEC_SIZE * -4), %rsi + + /* Load first half of the loop before entry. */ + VMOVA (VEC_SIZE * 0 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(3) + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + + /* Offset rsi by VEC_SIZE so that we can jump to + L(loop_last_4x_vec). */ + addq $-(VEC_SIZE), %rsi + KORTEST %k2, %k4 + jnz L(loop_4x_done) + + /* Store loop end in r9. */ + leaq -(VEC_SIZE * 5)(%rdx), %r9 + + .p2align 4,, 11 +L(loop_4x_vec): + VMOVU %VMM(0), (VEC_SIZE * 1 + 0)(%rdi, %rsi) + VMOVU %VMM(1), (VEC_SIZE * 2 + 0)(%rdi, %rsi) + VMOVU %VMM(2), (VEC_SIZE * 3 + 0)(%rdi, %rsi) + VMOVU %VMM(3), (VEC_SIZE * 4 + 0)(%rdi, %rsi) + + subq $(VEC_SIZE * -4), %rsi + cmpq %rsi, %r9 + jbe L(loop_last_4x_vec) + + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 4 + 0)(%rsi), %VMM(3) + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + KORTEST %k2, %k4 + jz L(loop_4x_vec) + +L(loop_4x_done): + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + /* Restore rdi (dst). */ + addq %rsi, %rdi + + /* L(ret_vec_x1) expects rcx to have position of zero-CHAR so + test with bsf. */ + bsf %VRCX, %VRCX + jnz L(ret_vec_x1) + VMOVU %VMM(0), (VEC_SIZE * 1 + 0)(%rdi) + + KMOV %k2, %VRCX + test %VRCX, %VRCX + jnz L(ret_vec_x2) + VMOVU %VMM(1), (VEC_SIZE * 2 + 0)(%rdi) + + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + bsf %VRCX, %VRCX + jnz L(ret_vec_x3) + VMOVU %VMM(2), (VEC_SIZE * 3 + 0)(%rdi) + + KMOV %k4, %VRCX + bsf %VRCX, %VRCX + VMOVU ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 4 + 0)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx, CHAR_SIZE) + ret + + + .p2align 4,, 4 +L(page_cross): + movq %rsi, %r8 + andq $(VEC_SIZE * -1), %r8 + VPCMPEQ (%r8), %VZERO, %k0 + +# ifdef USE_AS_WCSCPY + KMOV %k0, %VR9 + shrl $2, %ecx + andl $(CHAR_PER_VEC - 1), %ecx + shrx %VRCX, %VR9, %VRCX +# else + KMOV %k0, %VRCX + shrx %VRSI, %VRCX, %VRCX +# endif + + subl %esi, %r8d + andl $(VEC_SIZE - 1), %r8d +# ifdef USE_AS_WCSCPY + shrl $2, %r8d +# endif + cmpq %r8, %rdx + jbe L(page_cross_small) + /* Optimizing more for space as this is very cold code. This + saves 2x cache lines. */ + + /* This adds once to the later result which will get correct + copy bounds. NB: this can never zero-out a non-zero RCX as + to be in the page cross case rsi cannot be aligned and we + already right-shift rcx by the misalignment. */ + shl %VRCX + jz L(page_cross_continue) + bsf %VRCX, %VRCX + REP_MOVS + ret + +L(page_cross_small): + tzcnt %VRCX, %VRCX + jz L(page_cross_setz) + cmpl %edx, %ecx + cmova %edx, %ecx + +# ifdef USE_AS_WCSCPY + rep movsd +# else + rep movsb +# endif +L(page_cross_setz): + MOVCHAR $0, (%rdi) + ret +END(STRNCAT) +#endif diff --git a/sysdeps/x86_64/multiarch/strncpy-evex.S b/sysdeps/x86_64/multiarch/strncpy-evex.S index 1b3426d..49eaf4c 100644 --- a/sysdeps/x86_64/multiarch/strncpy-evex.S +++ b/sysdeps/x86_64/multiarch/strncpy-evex.S @@ -1,7 +1,990 @@ -#ifndef STRNCPY -# define STRNCPY __strncpy_evex -#endif +/* {wcs|wcp|str|stp}ncpy with 256/512-bit EVEX instructions. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (4) + + /* Use evex-masked stores for small sizes. Turned off at the + moment. */ +# define USE_EVEX_MASKED_STORE 0 + + +# include <sysdep.h> +# ifndef VEC_SIZE +# include "x86-evex256-vecs.h" +# endif + + +# ifndef STRNCPY +# define STRNCPY __strncpy_evex +# endif + +# ifdef USE_AS_WCSCPY +# define VMOVU_MASK vmovdqu32 +# define VPCMPEQ vpcmpeqd +# define VPMIN vpminud +# define VPTESTN vptestnmd +# define VPTEST vptestmd +# define CHAR_SIZE 4 + +# define REP_MOVS rep movsd +# define REP_STOS rep stosl + +# define USE_WIDE_CHAR + +# else +# define VMOVU_MASK vmovdqu8 +# define VPCMPEQ vpcmpeqb +# define VPMIN vpminub +# define VPTESTN vptestnmb +# define VPTEST vptestmb +# define CHAR_SIZE 1 + +# define REP_MOVS rep movsb +# define REP_STOS rep stosb +# endif + +# include "strncpy-or-cat-overflow-def.h" + +# define PAGE_SIZE 4096 +# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) + +# include "reg-macros.h" + + +# define VZERO VMM(7) +# define VZERO_256 VMM_256(7) +# define VZERO_128 VMM_128(7) + +# if VEC_SIZE == 64 +# define VZERO_HALF VZERO_256 +# else +# define VZERO_HALF VZERO_128 +# endif + + .section SECTION(.text), "ax", @progbits +ENTRY(STRNCPY) + /* Filter zero length strings and very long strings. Zero + length strings just return, very long strings are handled by + just running rep stos{b|l} to zero set (which will almost + certainly segfault), if that succeeds then just calling + OVERFLOW_STRCPY (strcpy, stpcpy, wcscpy, wcpcpy). */ +# ifdef USE_AS_WCSCPY + decq %rdx + movq %rdx, %rax + /* 56 is end of max supported address space. */ + shr $56, %rax + jnz L(zero_len) +# else + decq %rdx + /* If the flag needs to become `jb` replace `dec` with `sub`. + */ + jl L(zero_len) +# endif + + vpxorq %VZERO_128, %VZERO_128, %VZERO_128 + movl %esi, %eax + andl $(PAGE_SIZE - 1), %eax + cmpl $(PAGE_SIZE - VEC_SIZE), %eax + ja L(page_cross) + +L(page_cross_continue): + VMOVU (%rsi), %VMM(0) + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + + /* If no STPCPY just save end ahead of time. */ +# ifndef USE_AS_STPCPY + movq %rdi, %rax +# endif + + + cmpq $(CHAR_PER_VEC), %rdx + + /* If USE_EVEX_MASK_STORE is enabled then we just handle length + <= CHAR_PER_VEC with masked instructions (which have + potential for dramatically bad perf if dst splits a page and + is not in the TLB). */ +# if USE_EVEX_MASKED_STORE + /* `jae` because length rdx is now length - 1. */ + jae L(more_1x_vec) + + /* If there where multiple zero-CHAR matches in the first VEC, + VRCX will be overset but thats fine since any oversets where + at zero-positions anyways. */ + +# ifdef USE_AS_STPCPY + tzcnt %VRCX, %VRAX + cmpl %eax, %edx + cmovb %edx, %eax +# ifdef USE_AS_WCSCPY + adcl $0, %eax + leaq (%rdi, %rax, CHAR_SIZE), %rax +# else + adcq %rdi, %rax +# endif +# endif + dec %VRCX + + /* Zero out all non-zero CHAR's after the first zero match. */ + KMOV %VRCX, %k1 + + /* Use VZERO as destination so this can be reused for + L(zfill_less_vec) (which if jumped to by subsequent logic + will have zerod out VZERO. */ + VMOVU_MASK %VMM(0), %VZERO{%k1}{z} +L(zfill_less_vec): + /* Get mask for what we need to set. */ + incl %edx + mov $-1, %VRCX + bzhi %VRDX, %VRCX, %VRCX + KMOV %VRCX, %k1 + VMOVU_MASK %VZERO, (%rdi){%k1} + ret + + .p2align 4,, 4 +L(zero_len): + cmpq $-1, %rdx + jne L(best_effort_strncpy) + movq %rdi, %rax + ret + + .p2align 4,, 8 +L(more_1x_vec): +# else + /* `jb` because length rdx is now length - 1. */ + jb L(less_1x_vec) +# endif + + + /* This may overset but thats fine because we still need to zero + fill. */ + VMOVU %VMM(0), (%rdi) + + + /* Length must be >= CHAR_PER_VEC so match here means we must + zero-fill. */ + test %VRCX, %VRCX + jnz L(zfill) + + + /* We are going to align rsi here so will need to be able to re- + adjust rdi/rdx afterwords. NB: We filtered out huge lengths + so rsi + rdx * CHAR_SIZE cannot overflow. */ + leaq (VEC_SIZE * -1)(%rsi, %rdx, CHAR_SIZE), %rdx + subq %rsi, %rdi + andq $-(VEC_SIZE), %rsi + +L(loop_last_4x_vec): + addq %rsi, %rdi + subq %rsi, %rdx +# ifdef USE_AS_WCSCPY + shrq $2, %rdx +# endif + + VMOVA (VEC_SIZE * 1)(%rsi), %VMM(1) + VPTESTN %VMM(1), %VMM(1), %k0 + KMOV %k0, %VRCX + + /* -1 because of the `dec %rdx` earlier. */ + cmpq $(CHAR_PER_VEC * 2 - 1), %rdx + ja L(more_2x_vec) + +L(last_2x_vec): + /* This will be need to be computed no matter what. We do it + ahead of time for CHAR_PER_VEC == 64 because we can't adjust + the value of `tzcnt` with a shift. */ +# if CHAR_PER_VEC == 64 + tzcntq %rcx, %rcx +# endif + + cmpl $(CHAR_PER_VEC), %edx + jb L(ret_vec_x1_len) + + /* Seperate logic for CHAR_PER_VEC == 64 because we already did + `tzcnt` on VRCX. */ +# if CHAR_PER_VEC == 64 + /* cl == CHAR_PER_VEC iff it was zero before the `tzcnt`. */ + cmpb $CHAR_PER_VEC, %cl + jnz L(ret_vec_x1_no_bsf) +# else + test %VRCX, %VRCX + jnz L(ret_vec_x1) +# endif + + + + VPCMPEQ (VEC_SIZE * 2)(%rsi), %VZERO, %k0 + VMOVU %VMM(1), (VEC_SIZE * 1)(%rdi) + KMOV %k0, %VRCX + +# if CHAR_PER_VEC < 64 + /* This essentiallys adds CHAR_PER_VEC to computed result. */ + shlq $CHAR_PER_VEC, %rcx +# else + tzcntq %rcx, %rcx + addl $CHAR_PER_VEC, %ecx +# endif + + .p2align 4,, 4 +L(ret_vec_x1_len): + /* If CHAR_PER_VEC < 64 we still need to tzcnt, otherwise it has + already been done. */ +# if CHAR_PER_VEC < 64 + tzcntq %rcx, %rcx +# endif + cmpl %ecx, %edx + jbe L(ret_vec_x1_len_no_zfill) + /* Fall through (expectation) is copy len < buffer len. */ + VMOVU %VZERO, ((VEC_SIZE)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) +L(ret_vec_x1_len_no_zfill_mov): + movl %ecx, %edx +# ifdef USE_AS_STPCPY + /* clear flags. */ + xorl %ecx, %ecx +# endif +L(ret_vec_x1_len_no_zfill): + VMOVU ((VEC_SIZE)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) +# ifdef USE_AS_STPCPY +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (VEC_SIZE * 1)(%rdi, %rdx, CHAR_SIZE), %rax +# else + leal (VEC_SIZE)(%rdx), %eax + adcq %rdi, %rax +# endif +# endif + ret + + + .p2align 4,, 10 +L(ret_vec_x1): + bsf %VRCX, %VRCX +L(ret_vec_x1_no_bsf): + VMOVU %VZERO, ((VEC_SIZE)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) + subl %ecx, %edx + cmpl $CHAR_PER_VEC, %edx + jb L(ret_vec_x1_len_no_zfill_mov) + /* Fall through (expectation) is copy len < buffer len. */ + VMOVU %VMM(1), (VEC_SIZE * 1)(%rdi) + VMOVU %VZERO, (VEC_SIZE * 1)(%rdi, %rcx, CHAR_SIZE) +# ifdef USE_AS_STPCPY + leaq (VEC_SIZE * 1)(%rdi, %rcx, CHAR_SIZE), %rax +# endif + ret + + .p2align 4,, 8 +L(last_4x_vec): + /* Seperate logic for CHAR_PER_VEC == 64 because we can do `andl + $(CHAR_PER_VEC * 4 - 1), %edx` with less code size just + using `movzbl`. */ +# if CHAR_PER_VEC == 64 + movzbl %dl, %edx +# else + andl $(CHAR_PER_VEC * 4 - 1), %edx +# endif + VMOVA (VEC_SIZE * 5)(%rsi), %VMM(1) + VPTESTN %VMM(1), %VMM(1), %k0 + KMOV %k0, %VRCX + subq $-(VEC_SIZE * 4), %rsi + subq $-(VEC_SIZE * 4), %rdi + cmpl $(CHAR_PER_VEC * 2 - 1), %edx + jbe L(last_2x_vec) + .p2align 4,, 8 +L(more_2x_vec): + VMOVU %VMM(1), (VEC_SIZE * 1)(%rdi) + test %VRCX, %VRCX + /* Must fill at least 2x VEC. */ + jnz L(zfill_vec1) + + VMOVA (VEC_SIZE * 2)(%rsi), %VMM(2) + VMOVU %VMM(2), (VEC_SIZE * 2)(%rdi) + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + /* Must fill at least 1x VEC. */ + jnz L(zfill_vec2) + + VMOVA (VEC_SIZE * 3)(%rsi), %VMM(3) + VPTESTN %VMM(3), %VMM(3), %k0 + KMOV %k0, %VRCX + + /* Check if len is more 4x VEC. -1 because rdx is len - 1. */ + cmpq $(CHAR_PER_VEC * 4 - 1), %rdx + ja L(more_4x_vec) + + subl $(CHAR_PER_VEC * 3), %edx + jb L(ret_vec_x3_len) + + test %VRCX, %VRCX + jnz L(ret_vec_x3) + + VPCMPEQ (VEC_SIZE * 4)(%rsi), %VZERO, %k0 + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + KMOV %k0, %VRCX + tzcnt %VRCX, %VRCX + cmpl %ecx, %edx + jbe L(ret_vec_x4_len_no_zfill) + /* Fall through (expectation) is copy len < buffer len. */ + VMOVU %VZERO, ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) + movl %ecx, %edx +L(ret_vec_x4_len_no_zfill): + VMOVU ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 4)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) +# ifdef USE_AS_STPCPY +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (VEC_SIZE * 4)(%rdi, %rdx, CHAR_SIZE), %rax +# else + leal (VEC_SIZE * 4 + 0)(%rdx), %eax + adcq %rdi, %rax +# endif +# endif + ret + + +L(ret_vec_x3_len): + addl $(CHAR_PER_VEC * 1), %edx + tzcnt %VRCX, %VRCX + cmpl %ecx, %edx + jbe L(ret_vec_x3_len_no_zfill) + /* Fall through (expectation) is copy len < buffer len. */ + VMOVU %VZERO, ((VEC_SIZE * 3)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) +L(ret_vec_x3_len_no_zfill_mov): + movl %ecx, %edx +# ifdef USE_AS_STPCPY + /* clear flags. */ + xorl %ecx, %ecx +# endif + .p2align 4,, 4 +L(ret_vec_x3_len_no_zfill): + VMOVU ((VEC_SIZE * 3)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rdx, CHAR_SIZE), %VMM(0) + VMOVU %VMM(0), ((VEC_SIZE * 3)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx, CHAR_SIZE) +# ifdef USE_AS_STPCPY +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (VEC_SIZE * 3)(%rdi, %rdx, CHAR_SIZE), %rax +# else + leal (VEC_SIZE * 3 + 0)(%rdx), %eax + adcq %rdi, %rax +# endif +# endif + ret + + + .p2align 4,, 8 +L(ret_vec_x3): + bsf %VRCX, %VRCX + VMOVU %VZERO, (VEC_SIZE * 4 +(-(VEC_SIZE - CHAR_SIZE)))(%rdi, %rdx, CHAR_SIZE) + subl %ecx, %edx + jl L(ret_vec_x3_len_no_zfill_mov) + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + VMOVU %VZERO, (VEC_SIZE * 3)(%rdi, %rcx, CHAR_SIZE) +# ifdef USE_AS_STPCPY + leaq (VEC_SIZE * 3)(%rdi, %rcx, CHAR_SIZE), %rax +# endif + ret + + .p2align 4,, 8 +L(more_4x_vec): + VMOVU %VMM(3), (VEC_SIZE * 3)(%rdi) + test %VRCX, %VRCX + jnz L(zfill_vec3) + + VMOVA (VEC_SIZE * 4)(%rsi), %VMM(4) + VMOVU %VMM(4), (VEC_SIZE * 4)(%rdi) + VPTESTN %VMM(4), %VMM(4), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(zfill_vec4) -#define USE_AS_STRNCPY -#define STRCPY STRNCPY -#include "strcpy-evex.S" + /* Recheck length before aligning. */ + cmpq $(CHAR_PER_VEC * 8 - 1), %rdx + jbe L(last_4x_vec) + + /* Align rsi to VEC_SIZE * 4, need to readjust rdx / rdi. */ +# ifdef USE_AS_WCSCPY + leaq (%rsi, %rdx, CHAR_SIZE), %rdx +# else + addq %rsi, %rdx +# endif + subq %rsi, %rdi + subq $-(VEC_SIZE * 5), %rsi + andq $(VEC_SIZE * -4), %rsi + + + /* Load first half of the loop before entry. */ + VMOVA (VEC_SIZE * 0 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(3) + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + + + /* Offset rsi by VEC_SIZE so that we can jump to + L(loop_last_4x_vec). */ + addq $-(VEC_SIZE), %rsi + KORTEST %k2, %k4 + jnz L(loop_4x_done) + + /* Store loop end in r9. */ + leaq -(VEC_SIZE * 5 - CHAR_SIZE)(%rdx), %r9 + + .p2align 4,, 11 +L(loop_4x_vec): + VMOVU %VMM(0), (VEC_SIZE * 1 + 0)(%rdi, %rsi) + VMOVU %VMM(1), (VEC_SIZE * 2 + 0)(%rdi, %rsi) + VMOVU %VMM(2), (VEC_SIZE * 3 + 0)(%rdi, %rsi) + VMOVU %VMM(3), (VEC_SIZE * 4 + 0)(%rdi, %rsi) + + subq $(VEC_SIZE * -4), %rsi + cmpq %rsi, %r9 + jbe L(loop_last_4x_vec) + + VMOVA (VEC_SIZE * 1 + 0)(%rsi), %VMM(0) + VMOVA (VEC_SIZE * 2 + 0)(%rsi), %VMM(1) + VMOVA (VEC_SIZE * 3 + 0)(%rsi), %VMM(2) + VMOVA (VEC_SIZE * 4 + 0)(%rsi), %VMM(3) + + VPMIN %VMM(0), %VMM(1), %VMM(4) + VPMIN %VMM(2), %VMM(3), %VMM(6) + VPTESTN %VMM(4), %VMM(4), %k2 + VPTESTN %VMM(6), %VMM(6), %k4 + KORTEST %k2, %k4 + jz L(loop_4x_vec) + +L(loop_4x_done): + /* Restore rdx (length). */ + subq %rsi, %rdx +# ifdef USE_AS_WCSCPY + shrq $2, %rdx +# endif + VMOVU %VMM(0), (VEC_SIZE * 1 + 0)(%rdi, %rsi) + /* Restore rdi (dst). */ + addq %rsi, %rdi + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(zfill_vec1) + + VMOVU %VMM(1), (VEC_SIZE * 2 + 0)(%rdi) + KMOV %k2, %VRCX + test %VRCX, %VRCX + jnz L(zfill_vec2) + + VMOVU %VMM(2), (VEC_SIZE * 3 + 0)(%rdi) + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(zfill_vec3) + + VMOVU %VMM(3), (VEC_SIZE * 4 + 0)(%rdi) + KMOV %k4, %VRCX + // Zfill more.... + + .p2align 4,, 4 +L(zfill_vec4): + subq $(VEC_SIZE * -2), %rdi + addq $(CHAR_PER_VEC * -2), %rdx +L(zfill_vec2): + subq $(VEC_SIZE * -2), %rdi + addq $(CHAR_PER_VEC * -1), %rdx +L(zfill): + /* VRCX must be non-zero. */ + bsf %VRCX, %VRCX + + /* Adjust length / dst for zfill. */ + subq %rcx, %rdx +# ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +# else + addq %rcx, %rdi +# endif +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif +L(zfill_from_page_cross): + + /* From here on out its just memset(rdi, 0, rdx). */ + cmpq $CHAR_PER_VEC, %rdx + jb L(zfill_less_vec) + +L(zfill_more_1x_vec): + VMOVU %VZERO, (%rdi) + VMOVU %VZERO, (CHAR_SIZE - VEC_SIZE)(%rdi, %rdx, CHAR_SIZE) + cmpq $(CHAR_PER_VEC * 2 - 1), %rdx + ja L(zfill_more_2x_vec) +L(zfill_done0): + ret + + /* Coming from vec1/vec2 we must be able to zfill at least 2x + VEC. */ + .p2align 4,, 8 +L(zfill_vec3): + subq $(VEC_SIZE * -2), %rdi + addq $(CHAR_PER_VEC * -2), %rdx + .p2align 4,, 2 +L(zfill_vec1): + bsfq %rcx, %rcx + /* rdi is currently dst - VEC_SIZE so add back VEC_SIZE here. + */ + leaq VEC_SIZE(%rdi, %rcx, CHAR_SIZE), %rdi + subq %rcx, %rdx +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif + + + VMOVU %VZERO, (%rdi) + VMOVU %VZERO, (CHAR_SIZE - VEC_SIZE)(%rdi, %rdx, CHAR_SIZE) + cmpq $(CHAR_PER_VEC * 2), %rdx + jb L(zfill_done0) +L(zfill_more_2x_vec): + VMOVU %VZERO, (CHAR_SIZE - VEC_SIZE * 2)(%rdi, %rdx, CHAR_SIZE) + VMOVU %VZERO, (VEC_SIZE)(%rdi) + subq $(CHAR_PER_VEC * 4 - 1), %rdx + jbe L(zfill_done) + +# ifdef USE_AS_WCSCPY + leaq (%rdi, %rdx, CHAR_SIZE), %rdx +# else + addq %rdi, %rdx +# endif + + VMOVU %VZERO, (VEC_SIZE * 2)(%rdi) + VMOVU %VZERO, (VEC_SIZE * 3)(%rdi) + + + VMOVU %VZERO, (VEC_SIZE * 0 + 0)(%rdx) + VMOVU %VZERO, (VEC_SIZE * 1 + 0)(%rdx) + + subq $-(VEC_SIZE * 4), %rdi + cmpq %rdi, %rdx + jbe L(zfill_done) + + /* Align rdi and zfill loop. */ + andq $-(VEC_SIZE), %rdi + .p2align 4,, 12 +L(zfill_loop_4x_vec): + VMOVA %VZERO, (VEC_SIZE * 0)(%rdi) + VMOVA %VZERO, (VEC_SIZE * 1)(%rdi) + VMOVA %VZERO, (VEC_SIZE * 2)(%rdi) + VMOVA %VZERO, (VEC_SIZE * 3)(%rdi) + subq $-(VEC_SIZE * 4), %rdi + cmpq %rdi, %rdx + ja L(zfill_loop_4x_vec) +L(zfill_done): + ret + + + /* Less 1x VEC case if we are not using evex masked store. */ +# if !USE_EVEX_MASKED_STORE + .p2align 4,, 8 +L(copy_1x): + /* Special case for copy 1x. It can be handled quickly and many + buffer sizes have convenient alignment. */ + VMOVU %VMM(0), (%rdi) + /* If no zeros then we are done. */ + testl %ecx, %ecx + jz L(ret_1x_1x) + + /* Need to zfill, not we know that length <= CHAR_PER_VEC so we + only handle the small case here. */ + bsf %VRCX, %VRCX +L(zfill_less_vec_no_bsf): + /* Adjust length / dst then just zfill less_vec. */ + subq %rcx, %rdx +# ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +# else + addq %rcx, %rdi +# endif +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif + +L(zfill_less_vec): + cmpl $((VEC_SIZE / 2) / CHAR_SIZE), %edx + jb L(zfill_less_half) + + VMOVU %VZERO_HALF, (%rdi) + VMOVU %VZERO_HALF, -((VEC_SIZE / 2)- CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) + ret +# ifdef USE_AS_STPCPY +L(ret_1x_1x): + leaq CHAR_SIZE(%rdi, %rdx, CHAR_SIZE), %rax + ret +# endif + + +# if VEC_SIZE == 64 + .p2align 4,, 4 +L(copy_32_63): + /* Overfill to avoid branches. */ + VMOVU -(32 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %VMM_256(1) + VMOVU %VMM_256(0), (%rdi) + VMOVU %VMM_256(1), -(32 - CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) + + /* We are taking advantage of the fact that to be here we must + be writing null-term as (%rdi, %rcx) we have a byte of lee- + way for overwriting. */ + cmpl %ecx, %edx + ja L(zfill_less_vec_no_bsf) +# ifndef USE_AS_STPCPY +L(ret_1x_1x): +# else +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# else + movl %edx, %eax + adcq %rdi, %rax +# endif +# endif + ret +# endif + + .p2align 4,, 4 +L(copy_16_31): + /* Overfill to avoid branches. */ + vmovdqu -(16 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %xmm1 + VMOVU %VMM_128(0), (%rdi) + vmovdqu %xmm1, -(16 - CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) + cmpl %ecx, %edx + + /* Seperate logic depending on VEC_SIZE. If VEC_SIZE == 64 then + we have a larger copy block for 32-63 so this is just falls + through to zfill 16-31. If VEC_SIZE == 32 then we check for + full zfill of less 1x VEC. */ +# if VEC_SIZE == 64 + jbe L(ret_16_31) + subl %ecx, %edx +# ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +# else + addq %rcx, %rdi +# endif +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif +L(zfill_less_half): +L(zfill_less_32): + cmpl $(16 / CHAR_SIZE), %edx + jb L(zfill_less_16) + VMOVU %VZERO_128, (%rdi) + VMOVU %VZERO_128, -(16 - CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) +# ifdef USE_AS_STPCPY + ret +# endif +L(ret_16_31): +# ifdef USE_AS_STPCPY +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# else + movl %edx, %eax + adcq %rdi, %rax +# endif +# endif + ret +# else + /* VEC_SIZE == 32 begins. */ + ja L(zfill_less_vec_no_bsf) +# ifndef USE_AS_STPCPY +L(ret_1x_1x): +# else +# ifdef USE_AS_WCSCPY + adcq $0, %rdx + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# else + movl %edx, %eax + adcq %rdi, %rax +# endif +# endif + ret +# endif + + + .p2align 4,, 4 +L(copy_8_15): + /* Overfill to avoid branches. */ + movq -(8 - CHAR_SIZE)(%rsi, %rdx, CHAR_SIZE), %rsi + vmovq %VMM_128(0), (%rdi) + movq %rsi, -(8 - CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) + cmpl %ecx, %edx + jbe L(ret_8_15) + subl %ecx, %edx +# ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +# else + addq %rcx, %rdi +# endif +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif + .p2align 4,, 8 +# if VEC_SIZE == 32 +L(zfill_less_half): +# endif +L(zfill_less_16): + xorl %ecx, %ecx + cmpl $(8 / CHAR_SIZE), %edx + jb L(zfill_less_8) + movq %rcx, (%rdi) + movq %rcx, -(8 - CHAR_SIZE)(%rdi, %rdx, CHAR_SIZE) +# ifndef USE_AS_STPCPY +L(ret_8_15): +# endif + ret + + .p2align 4,, 8 +L(less_1x_vec): + je L(copy_1x) + + /* We will need `tzcnt` result for all other copy sizes. */ + tzcnt %VRCX, %VRCX +# if VEC_SIZE == 64 + cmpl $(32 / CHAR_SIZE), %edx + jae L(copy_32_63) +# endif + + cmpl $(16 / CHAR_SIZE), %edx + jae L(copy_16_31) + + cmpl $(8 / CHAR_SIZE), %edx + jae L(copy_8_15) +# ifdef USE_AS_WCSCPY + testl %ecx, %ecx + jz L(zfill_less_8_set_ret) + + movl (%rsi, %rdx, CHAR_SIZE), %esi + vmovd %VMM_128(0), (%rdi) + movl %esi, (%rdi, %rdx, CHAR_SIZE) +# ifdef USE_AS_STPCPY + cmpl %ecx, %edx +L(ret_8_15): + adcq $0, %rdx + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# endif + ret +L(zfill_less_8_set_ret): + xorl %ecx, %ecx +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif +L(zfill_less_8): + movl %ecx, (%rdi) + movl %ecx, (%rdi, %rdx, CHAR_SIZE) + ret +# else + cmpl $3, %edx + jb L(copy_0_3) + /* Overfill to avoid branches. */ + movl -3(%rsi, %rdx), %esi + vmovd %VMM_128(0), (%rdi) + movl %esi, -3(%rdi, %rdx) + cmpl %ecx, %edx + jbe L(ret_4_7) + subq %rcx, %rdx + addq %rcx, %rdi +# ifdef USE_AS_STPCPY + movq %rdi, %rax +# endif + xorl %ecx, %ecx + .p2align 4,, 8 +L(zfill_less_8): + cmpl $3, %edx + jb L(zfill_less_3) + movl %ecx, (%rdi) + movl %ecx, -3(%rdi, %rdx) +# ifdef USE_AS_STPCPY + ret +# endif + +L(ret_4_7): +# ifdef USE_AS_STPCPY +L(ret_8_15): + movl %edx, %eax + adcq %rdi, %rax +# endif + ret + + .p2align 4,, 4 +L(zfill_less_3): + testl %edx, %edx + jz L(zfill_1) + movw %cx, (%rdi) +L(zfill_1): + movb %cl, (%rdi, %rdx) + ret + + .p2align 4,, 8 +L(copy_0_3): + vmovd %VMM_128(0), %r8d + testl %edx, %edx + jz L(copy_1) + movw %r8w, (%rdi) + cmpl %ecx, %edx + ja L(zfill_from_1) + movzbl (%rsi, %rdx), %r8d +# ifdef USE_AS_STPCPY + movl %edx, %eax + adcq %rdi, %rax + movb %r8b, (%rdi, %rdx) + ret +# endif + +L(copy_1): +# ifdef USE_AS_STPCPY + movl %edx, %eax + cmpl %ecx, %edx + adcq %rdi, %rax +# endif +# ifdef USE_AS_WCSCPY + vmovd %VMM_128(0), (%rdi) +# else + movb %r8b, (%rdi, %rdx) +# endif + ret +# endif + + +# ifndef USE_AS_WCSCPY + .p2align 4,, 8 +L(zfill_from_1): +# ifdef USE_AS_STPCPY + leaq (%rdi, %rcx), %rax +# endif + movw $0, -1(%rdi, %rdx) + ret +# endif + + .p2align 4,, 4 +L(zero_len): + incq %rdx + jne L(best_effort_strncpy) + movq %rdi, %rax + ret +# endif + + + .p2align 4,, 4 + .p2align 6,, 8 +L(page_cross): + movq %rsi, %rax + andq $(VEC_SIZE * -1), %rax + VPCMPEQ (%rax), %VZERO, %k0 + KMOV %k0, %VRCX +# ifdef USE_AS_WCSCPY + movl %esi, %r8d + shrl $2, %r8d + andl $(CHAR_PER_VEC - 1), %r8d + shrx %VR8, %VRCX, %VRCX +# else + shrx %VRSI, %VRCX, %VRCX +# endif + + /* Compute amount of bytes we checked. */ + subl %esi, %eax + andl $(VEC_SIZE - 1), %eax +# ifdef USE_AS_WCSCPY + shrl $2, %eax +# endif + + /* If rax > rdx then we are finishing the copy at the end of the + page. */ + cmpq %rax, %rdx + jb L(page_cross_small) + + + /* If rcx is non-zero then continue. */ + test %VRCX, %VRCX + jz L(page_cross_continue) + + /* We found zero-CHAR so need to copy then zfill (we know we + didn't cover all of length here). */ + bsf %VRCX, %VRCX +L(movsb_and_zfill): + incl %ecx + subq %rcx, %rdx +# ifdef USE_AS_STPCPY + leaq -CHAR_SIZE(%rdi, %rcx, CHAR_SIZE), %rax +# else + movq %rdi, %rax +# endif + + REP_MOVS +# ifdef USE_AS_WCSCPY + movl $0, (%rdi) +# else + movb $0, (%rdi) +# endif + jmp L(zfill_from_page_cross) + +L(page_cross_small): + tzcnt %VRCX, %VRCX + cmpl %ecx, %edx + jbe L(page_cross_copy_only) + + /* Do a zfill of the tail before copying. */ + movq %rdi, %r9 + xorl %eax, %eax + + movl %ecx, %r8d + + subl %ecx, %edx + leaq CHAR_SIZE(%rdi, %rcx, CHAR_SIZE), %rdi + movl %edx, %ecx + REP_STOS + movq %r9, %rdi + movl %r8d, %edx +L(page_cross_copy_only): + leal 1(%rdx), %ecx +# ifdef USE_AS_STPCPY +# ifdef USE_AS_WCSCPY + adcl $0, %edx + leaq (%rdi, %rdx, CHAR_SIZE), %rax +# else + movl %edx, %eax + adcq %rdi, %rax +# endif +# else + movq %rdi, %rax +# endif + REP_MOVS + ret + + +L(best_effort_strncpy): + movq %rdx, %rcx + xorl %eax, %eax + movq %rdi, %r8 + /* The length is >= 2^63. We very much so expect to segfault at + rep stos. If that doesn't happen then just strcpy to finish. + */ + REP_STOS + movq %r8, %rdi + jmp OVERFLOW_STRCPY +END(STRNCPY) +#endif diff --git a/sysdeps/x86_64/multiarch/strncpy-or-cat-overflow-def.h b/sysdeps/x86_64/multiarch/strncpy-or-cat-overflow-def.h new file mode 100644 index 0000000..d4f4d6c --- /dev/null +++ b/sysdeps/x86_64/multiarch/strncpy-or-cat-overflow-def.h @@ -0,0 +1,80 @@ +/* Helper for getting proper name of overflow fallback function for + {wc|st}{p|r|s}n{cat|cpy} + + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _STRNCPY_OR_CAT_OVERFLOW_DEF_H_ +#define _STRNCPY_OR_CAT_OVERFLOW_DEF_H_ 1 + +#if defined USE_MULTIARCH && IS_IN(libc) +# define UNDERSCORES __ +# ifdef USE_WITH_SSE2 +# define ISA_EXT _sse2 +# elif defined USE_WITH_AVX2 +# ifdef USE_WITH_RTM +# define ISA_EXT _avx2_rtm +# else +# define ISA_EXT _avx2 +# endif + +# elif defined USE_WITH_EVEX256 +# define ISA_EXT _evex +# elif defined USE_WITH_EVEX512 +# define ISA_EXT _evex512 +# endif +#else +# define UNDERSCORES +# define ISA_EXT +#endif + +#ifdef USE_AS_WCSCPY +# define STRCPY_PREFIX wc +# define STRCAT_PREFIX wcs +# ifdef USE_AS_STPCPY +# define STRCPY_POSTFIX pcpy +# else +# define STRCPY_POSTFIX scpy +# endif +#else +# define STRCPY_PREFIX st +# define STRCAT_PREFIX str +# ifdef USE_AS_STPCPY +# define STRCPY_POSTFIX pcpy +# else +# define STRCPY_POSTFIX rcpy +# endif +#endif +#define STRCAT_POSTFIX cat + +#define PRIMITIVE_OF_NAMER(underscores, prefix, postfix, ext) \ + underscores##prefix##postfix##ext + +#define OF_NAMER(...) PRIMITIVE_OF_NAMER (__VA_ARGS__) + +#ifndef OVERFLOW_STRCPY +# define OVERFLOW_STRCPY \ + OF_NAMER (UNDERSCORES, STRCPY_PREFIX, STRCPY_POSTFIX, ISA_EXT) +#endif + +#ifndef OVERFLOW_STRCAT +# define OVERFLOW_STRCAT \ + OF_NAMER (UNDERSCORES, STRCAT_PREFIX, STRCAT_POSTFIX, ISA_EXT) +#endif + +#endif |